OK, that's interesting.
@Malevolent may give you a different reading of these two headphones, especially in the bass region. I would say the T5p has more detailed and more forward mids, which may be more to your liking (the 2000Ti is also more mid focused). I also find the T5P somewhat more relaxed and smoother.
That's curious you hear the bass as flabby. The MSR7B has a much leaner profile, which gives less space for the bass to extend itself, which could give the impression of being tighter. Sloppy and flabby are not the words that come to my mind, though, but we hear things differently. I'm listening to "Speed Demon" by Michael Jackson as I write this, and I hear the bass as punchy and tight. What's your source for the WP900?
Keen to hear more of your impressions.