I agree with this from the P47 side. I have tried to out dive a 109 and it hasn't worked using just a straight dive. 109s are very difficult for me to deal with on a one on one P47M vs 109. I guess that is why there are so many i109s are in the MA. I can do better with them in a furbal where I can make climbing turns.
I have a long way to go to get the most out of a 47M but I am getting there.
IDK, situation may have changed since I left, but there seemed to be relatively few 109's in the MA's only a bit more than a year ago.
I never would have called them rare, or anything; its not like could go to a decent sized fight and not see at LEAST one. But I never would have called them 'common' either, at least not overall.
It seems to me you're either just noticing them more because you're having problems with them, or you're flying at an altitude band thats a hot-spot for 109's.
Try flying higher. All aircraft tend to thin out with altidue, and anything 10K and higher significantly increases the odds that any 109 you'll bump into will be either a G-model packing gondies for buff hunting, or a K-4, in which case you're either screwed or are in for a fight.
Also, 190's become rather rare at high altidue since they cap out for speed at only 21K or so, and only crack 400mph which isn't stellar (the K4 can almost make 400mph at 5k for comparison). Go very high, and you'll start bumping into Ta-152's every now and then.