We have analysis paralysis here. Let the ears decide. Try both and whichever sounds better becomes the preferred option. Specs are great if you're measuring ALL the pertinent parameters; maybe there's more going on than just rumble. It could be that extra mass has unforeseen benefits and that an important metric has been overlooked.
Exactly! If I like what I'm hearing from a system, and have assessed the efficacy of something (such as a record weight), using my own ears and judgement, I couldn't give a flying fook what measurements say to the contrary, particularly when they're obviously NOT telling the full story!!!

Measuring anything else but ALL pertinent parameters, when assessing something, is simply a recipe for a flawed analysis.

Marco.