I don't have too much experience flying the 109, I prefer the f4u. But I have fought alot of the good 109 pilots, and that way I have learned how THEY fly the 109. Learned the hard way I might add..

I used to go after the best 109pilots in DA and tried to figure their tricks out as I fell for them.. EAce is one of them, and I've learned alot from duelling him over and over. He's one of the greater 109 sticks I have fought!
In the beginning there was alot of me being blown all over the sky by a much faster and lighter 109, later I started to notice my mistakes. As trying to follow him into the climb every time just to drain my E before he dropped down and blew me away before I could turn anywhere..

So from what I've seen,
the best way to fly the 109 is; stay fast, stay ontop and use the climb advantage to drain other planes energy off before zooming them before they reach to recover their E. At the point they start to get slow u want to allready be on your way down to get him before he gets enough E to counter your attack by a sudden move.. And after the attack zoom right back up there to give it another go if it was a miss.
The way I've learned
to counter the high 109 when I'm in my hog is to watch my speed very carefully as I climb. I never go below 150, then I level off at that speed and let the 109 climb as much as he likes. Keep my eyes at him at all times, just circle around and wait for him to make his move..
When he does I try to keep my speed up and trying to go level at a 90 degree angle from him, or if he zooms down from behind I try to gently break off to one side without losing too much E. Then I am just waiting for him to get about 800 from me, he has got his speed well up and is concentrated on his aim.. Then I point my wing at him to give him less plane surface to aim for and zoom up, his speed will most likely be too high to follow and he will
hopefully miss his shot. Then I roll over as he passes behind me and pull back so I can give him a well placed burst before he gets out of guns reach on his zoom back up.. If I time it well I can get some damage to him so his next attempt will not be as easy. If I time this move perfect so his pass gets close I might get a killshot right there also.
I think my advice is to just team up with a really good 109 stick, and just observe him fighting from a distance or from the passenger seat. Save the film for later views, and observe things like speed, angles of attack, trottlework and flaps usage if ever that slow. And also duel that same stick no less than 10 sorties to manage to point out what mistakes you tend to do over and over, if any.. But main keywords to success in a 109 is
speed and
energy I think.
