Don't jump to any conclusions without making prints first David. After all, the print is the final product and not the negative, right?
I've developed many HP5 negs in ABC, PMK, and Split D23. Interestingly enough, the split D23 negs appeared thin by comparision, but, when making enlargements from 120 roll film as well as some of my 8X10" contacts, those thin looking negs produced wonderful prints.