That's interesting that you say that they have a looser feel. I have noticed (and this may be a crazy mis-perception) that the DiMarzio pots have a tad less bass response and a bit brighter/less spongy feel. Albeit this is referenced against a few different guitar's stock electronics and not the brands you mentioned. Who knows this could be nothing more than the difference between bad stock wiring muddiness to good components and soldering.