Like the men above advised.
You might consider a non-warbird for awhile until you get more stick time and the reflexes down unless you don't mind replacing planes all the time.
You will also be better served on the more difficult planes if you use EXPO. Here's a hidden function for the DX5e:
[The DX5e has a fixed expo function, about 20% or so. To enable it, hold right aileron trim and then turn on the transmitter. You'll hear a series of ascending tones. To disable it, hold left aileron trim and turn it on. You'll hear a series of descending tones indicating that it's off.]
Using Hi/Lo switch will help also.
Even better would be to step up to a DX6i or DX7.