Debait
BNZ - The bottom line is that the XVI is too slow in practice. Theory doesn't matter if it never materializes. The 152 and 38J ought to be perked if enough skilled pilots flew it to unbalance gameplay enough, yes. That's not the case though. Just like the XVI isn't used and abused enough to unbalance gameplay. And this is coming from someone with not much more than distaste for em.
I don't know about the chog. I think the firepower on that platform (best flaps in the game, etc, we've covered this already) is enough. Borderline, but enough. I personally don't really care except that it would most likely really skew useage off CVs (at least).
That the Temp (or 262 - viz 38s, 47s, 51s, etc) is vulnerable to many of the other planes doesn't change the rest of the picture. It still is the punchiest accelerator all the way to arguably the fastest top prop-driven speed bar-none, has 4 high ROF cannons with excellent ballistics, excellent visibility, can carry 2klbs, isn't restricted to a narrow altitude range for these abilities, etc. You aren't taking things in the full context. In the full practical context the XVI is just too slow to be perk worthy. There's no way to spin this one. It's a holistic assessment.
Or not worth more than 1-2 perks anyway. Definitely not 3 perks.