One big problem with AH WEP in general is that once you disconnect and reup in flight means WEP is used up totally, which in turn mean you will not engage in your WEP-crippled plane anytime soon if not at great advantage - your plane is not competive in Melee arena until you can use WEP for at least for a bunch of minutes.
As an example FW190A rely heavly on WEP to stay competetive, and have 1:4 recharge time for it's 10 minutes of WEP, for 10 minutes cooling means 2,5 minutes of WEP back to use.
Yak3 on the other hand can happlily fly on at 100% without any hitch.