JTM I think if you go back and look at your comments it appears that you think JPJ cattle have no place and are not low bw. I believe you whole heartedly when you say these genetics did not work for you in your program/environment. However, I have had the complete opposite where he has done wonders in reducing both bw and mature cow size. So, if you would have stated it as if he didn't work for you but may for someone else that may not have received such blowback. I will agree that he does not help in the growth department but, you have to realize that everyone's herd is at a different place, i.e. some may have bred in too much growth some may have over bred on low bw etc. So, again what may work for one may not work for another.
To the original poster what are your goals with the resulting Calf so, myself and others can help direct you towards genetics that should work for you?