I've read in here that you can increase the capacity by shimming up the relief valve. I haven't done it myself to know how much the actual gain is, but I would imagine that it would still be within the limits of the loader such that you won't rip it apart. You will always run that chance with an after market brand. Plus the shims are fairly inexpensive.
Maybe the more experienced tbn'ers can weigh in and actually walk you and I through installing them.