I'm not used to DP caps being used for soak tests, only skill tests, (since the suggested cap is 20 or 2*(att+skill), whichever is highest.)
Anyone with 5 or more body is going to butt up against that 20DP soak cap with a little bone work and a good combination of armor. Seems punishing to the tank, which is a fun build, and really the only way to do a melee beserker. Hell, even the GMC bulldog comes with 24 soak dice standard. I'd check with him to see if he means that cap to apply to all pools, but I guess the main tank counter, magic, being gone means that you've got to draw a line somewhere.