Although I agree that pump shotty does do a significant amount of damage, I feel that the automatic weapons are more of an issue. Pump has dropped significantly in effectiveness knock-back against zombies (IMO), but I think Pl@y will have more thoughtful input on that aspect?
Para... I would really like to see this go down to at least 1.00 (preferably 0.75-ish?). Reason being, this weapon has a LOT of power, a LOT of rounds, and when you get 2-3 BAD players in a crouch spot with these, you're pretty much guarenteed the round. The change isn't necessarily because I see a good deal of people using it to climb in rank, but rather to encourage people to NOT go for the B.F.G. EVERY SINGLE ROUND. If you're trying to get back some of the challenge of the old days, this should be looked into IMO (ya'know, those days when 4-5 players would go into the crouch tunnel on zm_snoopie and hold back zombies with TMP's.... *sigh*).
Zombie_claws could be reduced by half given the current system in place, but you may want to try a 20-30% reduction first. Reason being, the "Beating the Odds" mod should really encourage more cooperation with humans, we won't have to deal with players jumping in mid-game on escape maps to get points, and those alone should really help balance out the current situation. I think a lot of these stats will need to be altered after we see how the new mod affects players (hopefully in a positive way).
Not much to say on the BTO mod really, I think it sounds amazing to be honest. Really looking forward to seeing it on the server and getting people more in the "coop" mind-set as opposed to the "be on top" mind-set. As always, great thoughts, and appreciate the work going into ZMOD development ^_^.