Wait a tec, ill re read your post and then update this message.
EDIT: Ok, first off, in terms of FleshPound. The fleshpound rage thing is wrong, not the Beserker being over powered. The Scrake stun is part of the Beserkers ability and should remain. I can take a Scrake on 6 Man Suicidal with quite a few classes by myself, you've just got to adjust your play to suit the perk you play. Same as the Fleshpound, you can solo him but it is difficult.
When you say without armor, it doesn't really change too much, as one hit won't kill you if you are on full health as any perk will it? Please correct me if I'm wrong, it's been known to happan. But if this is the case, you could probably take the FleshPound as a SharpShooter easily enough, a Spport can rape a FleshPound, A Demolitions can rape Fleshpound, and the other perks aren't designed to tae on larger zeds, so includin them will actually provide false information.
EDIT II: I've now reread the first post and found that your main contention is the Beseker bein able to defeat most specimens by kiting. Fair enough, this is how he should be played. I've found that most situations on harder difficulties require me to kite, no matter what perk i am. Me and my friend kite as lvl 6 Support some times and it works really well, so it's not just the Beserker who can do it.
In terms of Beserkers over all power against zeds, i believe that eh is reasonable at the moment, it's not liek the SharpShooter used to be and really, most games I join aren't overrun by beserkers, so thats got to say something. I know i'm gonna hate myself for saying this, as a Support favoured player, but the Support is just a wall of carnage and really while you are probably more likely to survive in the long run as a Beserker, it takes a long time to finish a wave sometimes and an effective team of Supports will ahve it finished in no time. So my point is that Beserker is not the msot overpowered perk, it's probably about right.
The only thing I'd fix is the FleshPound rage mechanics and from there we can see how it goes and make further decisions.
Feel free to go against what I say, as it is only my opinion. In no way should this be looked at as the answer, it's just my thoughts. I'm happy for others to make counter arguements, and am even willing to change my mind should a good example arise!