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You're welcome.

Some insights here:  A relationship between longer draws and increased efficiency can be witnessed.  The longer Korean carbon arrows, albeit heavier, yield higher efficiency for both the HMG and Hwarang/YMG.  Higher velocity is maintained with the shorter-lighter Goldtip.  The story is not quite the same for the gak-gung as the bamboo arrows of same length yet varying weights yield results contrary.

While it may be in haste to conclude the synthetics as superior in regards to efficiency, I should note that 31 inches is in fact just about all you're going to get out of my two gak-gungs.  Perhaps if I could find a gak-gung with a longer max draw the story would be different.  Knowing how both gak-gung operate, I can somewhat confidently conclude that 31" is it for them. A heavier arrow may in fact make a difference for the gak-gung made by Mater Kim Seok-Jae.  I may purchase some new Korean bamboo arrows in the future at longer length and heavier weight just to make sure. 

Aside from the comparisons, one has to appreciate the output for the YMG-Hwarang.  In all likelihood, an arrow at 10 gpp with at least a 32" draw would push the YMG-Hwarang to about 0.90 efficiency at ~ 200 fps.  This would make the YMG-Hwarang comparable to the Saluki Damascus/Tatar style bow which currently dominates all performance levels tested and accounted for in this thread.

***Update***

Let's do a side by side comparison to the gak-gung vs. the synthetic laminates:

Bow: YMG/Hwarang (jang-gung)
Bow rating: 55bs@31"
Actual draw: 57.2lbs@32" for shorter arrow and 58lbs@32.5" for longer arrow
Arrow type: Goldtip@32" and Korean carbon@33.5"
Arrow weights: 400.93 (Goldtip) and 447.22 (Korean carbon) grains
GPP: 7 (Goldtip) and 7.71 (Korean carbon)
FPS: 231 (Goldtip) and 223 (Korean carbon)

Energy/ft-lbs: 47.49 (Goldtip) and 49.37 (Korean carbon)
Efficiency: 0.82 (Goldtip) and 0.86 (Korean carbon)

On a side note, Koreans do apparently practice a type of flight shooting.  Except its known as 'far shooting' in the language: 멀리 쏘기.  Usually done on long sandy beaches.

Footage: http://blog.daum.net/woo-139/257

So I take it you are using an actual luggage scale to get these results?

Well if the bows are rated around 60lbs at whatever draw length combined with with a light enough arrow then sure.

But I'd redo math for your bow rated at 40lbs.

It might help to post the question and answer regarding the text that you ran through google translate:

I did run them both through google translate and few other translators.  While it seems this would be about 'Korean tiller' by just glancing over the translation, I think a more precise translation of the question and answer would help.  I'd ask bluelake for some help here but already bugged him about some other things requiring translation and don't want to bother people too much with this stuff.  I'll just leave it here and someone qualified maybe can chime in one day with a much more precise translation so we can better understand what is being discussed.

That's a huge leap btw.  The formula I use looks like this:

(rated draw weight)/(rated length - brace height)*(draw length - brace height)

Based on that I get 47.11111111111117 lbs@32".  That's of course assuming your Kaya is 40lb@28" and your brace height is either 5.5 or 6 inches.  For this result, I assumed it was 5.5 inches.  Even with 6 inches it would be within range of that.  But definitely not 60lbs.

I'll try tomorrow.  I just sent them an email.  Should be interesting to see if they write anything back.

Oh I just saw this.  I might try and write to them in Korean.  Not that I'm fluent but I am persistent.  Usually in these circumstances, they won't sell to you direct and if they do they want a bank wire transfer.  I absolutely refuse to do this because my bank is so bad at this.  I could write to them just for the heck of it though.

Well this what translates on their homepage into English:

Don't see anything explicity talking about 'Korean tiller' or how the upper limb tilts in on direction or the other.  I'm not noticing the RH/LH thing in the shop section either but as I discussed with Shinla, it most likely pertains to arrow pass orientation.

Anyway, at this point I'd love to order directly off their site.  I really like how they finish the bow with wrapping and covering.  Looks nicer than what Koreanbows does with with the HMG/Nomad (really annoying covering).

Have you ordered from them direct or had success communicating with them?