Okay, gonna try to explain what I said previously(might not be everything):
F6F-5N to 4.0
There are a few planes that really requires 80%+ radiator output to maintain the overheating just a little bit. The complete neglegence of energy aspects kinda makes it undesirable at 4.3. Arguably due to being an okay fighter as well as a decent CAS platform, while before the split BR took place, for the time being.
Seafire LF Mk.III to 4.3, Seafire F Mk.XVII to 5.0, Seafire FR 47 to 5.3:
These fighters, while have excellent high-speed mobility and are considered to be some good BnZ fighters, lacks the ability to exploit energy advantages because they are not very good at climbing. Also subpar turnfightings
Reverting 8.0-9.0 changes:
Legacy top tier is rather unplayable, and it is indeed due to compressions, but decompressing the BR at the cost of 7.0-8.0 kinda doesnt help, instead of decompressing 9.0-10.0.
Reverting Q-5A changes:
Alternatively, give it PL-2.
Reverting AMX A-11B changes:
Alternatively, take the A-6E with it, or give it AS-30L.
Su-22M3 SyAF/HuAF to 10.3, without R-60M:
The Su-22M3 is effectively, a 10.3 CAS and a 10.3 fighter put together, unlike most soviet designs which cant do both at the same time, hence why it might be placed at 10.7. It is not bad, but still being one of the worst 10.7 aircrafts, due to namely the lack of effective standoff attack methods, with flares and RWR. R-60Ms will only make them even harder to balance.
Buc S.2B to 10.0, without AIM-9L:
Before split BR, planes like this would still be a pain in the ass to balance. And before the said changes takes place, maybe it could be placed at a lower BR compared to GR.1A to compensate for the lack of thermal pods, and temporarily removing AIM-9Ls.
M3C to 10.0, while Shahak given AIM-9G:
Idk if the latter change is possible historically, anyway, the lack of RWR and flares makes them unfitting to be placed at the same BR of the M3E.
J-7D to 10.7:
Effectively a MiG-21MF with PL-5B. The J-7E has modernized RWR and incredible energy management for a MiG-21 airframe, both the J-7D lacks. Despite how much better they are compared to the R-60, PL-5Bs are hardly two increments worthy.
J-8F to 11.3:
Comparing to the K2K, the J-8F has better FM and HMD, yet not having any guided A2G options and much worse dumb bomb payloads. These should not result in a difference in BR.
F-16A ADF USAF/AMI to 12.3 with AIM-9M:
This is more of a diversification of gameplay, both the nations mentioned has 12.0 fighters, albeit not in the same role.
Netz to 12.0:
PT3s are not much of a privilege nowadays. Similar to the J-8F, the PT3s should not result in a higher BR. Not to mention that the netz lacks sparrows.