I find the TH-900 much brighter up top than the Elear. In fact, even without comparing it to the Elear, and just taking the TH-900 in isolation, I find it to be much brighter and more strident than I would prefer, in and of itself. Given your stated preferences, I think it's fairly likely that you'd feel the same, and find it fatiguing at best, and perhaps even unlistenable at worst. Also, while I think the TH-900 is bassy, I'd hesitate to call it warm.
BTW - and this is for everybody in general - if you happen to be a fan of the HD-650’s general sound signature, and you're looking a headphone that does everything you love about a well-driven HD 650, then you might want to consider the Elear as a worthy upgrade. There’s a decent chance that it’ll be your huckleberry. There were times during my auditions when the Elear was reminiscent of the best HD 650 I've ever heard, but even better. Plus, as a bonus, it looks much nicer, and is far easier to drive.