I've been horsing around in a 163 lately. I've lost about 6 of them, almost always as a result of running out of fuel and then being picked off as I try to glide back home. More than half my successful landings have been dead-stickers.
Yesterday afternoon, I changed sides from Bish to Rook. That's only my second side switch since joining AH, and I did it because the Rooks were being hammered by the knits - down to 2 bases and on the way to losing those. The 163 cost me only about 20pp by that stage.
I don't think perkage needs to be made more severe, but I do think now that we have the "sliding scale" of perk plane costs, governed by the proportion of players on each side, the game would benefit from perking a few additional planes.
Look at any competent player's stats. Then look at mine for the last 6 months. Likely as not, in the list of planes killed sorted by plane type, the LA7/P51/Spit-ix will be in the top 5 tour after tour - not just for me but for competent pilots as well. It's not because they're easier to kill. It's because there are more of them.
If the LA7 and P51 had a nominal perk value of 6pp, and 4pp for the Spit ix, we could expect this to reduce to 3pp and 2pp respectively for the side that was being trounced, and to rise to 12pp and 8pp for the side doing the trouncing. I have to pay around 13pp for my Chogs, but I don't mind because it's a good plane which enables it to pay its way - great for carrier ops, and killing a PT boat (easy) nets 3pp. So I don't see why the same thing should not apply to the big three - LA7/P51/Spit-ix - in the name of striving for a more balanced game.
I fully support the 12 hour minimum interval between side switches - cuts out all the opportunist side switching. Did someone say it stops people changing to the weakest side? ROFL. I would say most people wishing to switch sides more than once every 12 hours are wanting to join the winning side to pad their scores.