The La7 and Yak3 (and Yak 9u which imho is better than the -3 ) are pretty meh over 15k. At 20k the K4 has 40mph on the La, and the 109D9 has about 20mph. In fact the LAs boost means it pretty much sucks the kumara between 7 and 16k as well. The 109K4 still whoops the 47M up 25k - which is where the combat is going to be.
If the Allied CiC's can't identify the advantages you have and plan accordingly, that's their fault. I think you'll find that if the player numbers are within the expected attendance, that the event will play out very evenly - assuming the same level of competence across both sides. The Allies have the tools to be very successful, I'm sure LilMak will use them well when the 56th has CiC.
As I read it the A8 and G14 are entirely optional?
Yes. I would expect to see both used, though. The A-8 is very useful, and some guys prefer the G-14 over the K-4.