I normalize the virtual size cat gain with the material damage multiplier. For example, I replace Orichalcums VSCs with the flat x12 damage multiplier. They get a bonus to str, sure, that bonus would technically increase VSCs, of course, but VSC will max out at let's say they have 400 HD at 400 HD, nothing changes with that. However, now, as they're Body is literally made of Orichalcum they get a x12 to the dice damage, so, 400d20 let's say, would become 4800d20. That way the damage dice monkey player can still get his CRAZY damage dice, but it never will reach 20 bazillion dice of damage, not until they're highlord stage whatever and it will still be far more controllable as a DM.