I'll leave it up to others who may want to help you in the TA, but I'll post a couple of comments that may (or may not?) help.
You have to remember it's a 1940 aircraft. It's got a lot of horsepower for its time, but at the time 1200hp was high.
On top of that, like later 109s (maybe more so, because of the lesser horsepower) it suffers when flown on full internal fuel. In the FSO you will need to take full fuel, and hope that by the time you encounter the enemy you've drained some of it off.
As for vertical manuvers, just try to get a feel for when it gives out and nose her down (or complete the loop) before that happens. Keep an eye on your speed -- or at least the relative "feel" of the speed. Try not to hang on the prop if you can. Use fluid loops or immelmans or some other move to gain altitude (spiral climbs, anyone?). The problem with the nose-high hang-on-the-prop is that the 109E is a bit of a pig at stall speeds. It really shines just above the stall speed, but if you are coming out of a rope/zoom, and even you avoid the fall/stall/flop, you're still a sitting duck unless you dive back down to regain some speed.
In general, if it hurts when you poke yourself in the eye, stop poking yerself in the eye!

(Meaning: try not to use the stall-out-while-nose-high manuver so much!)
P.S. If memory serves, I think the E-4 only has 5 minutes of WEP, not 10 like its later brothers. Use it a bit more sparingly. If you can. I realize that sometimes the fight dictates your WEP use.