I use a bit of hardware implanted EQ from my Arrow amp. Bass boost to add more warmth to the lower mids and with certain albums I use the cross feed implantation. In general the cross feed on the Arrow takes a bit of the top and bottom and blend into the mids without collapsing the sound stage too much.
I found that the Clip+ actually sounds surprisingly good with the T-Peos and when RB a decent EQ and cross feed options are available. So far I haven't used any EQ or cross feed with the Clip+, but may play around with it when I have more time to do so.
Regarding the W4. As with the RE262, both are very different IEM's than the T-Peos and to me hard to say which one is better, it really depends what I want to listen to. So in that aspect they can complement each other very well.
I really like to listen to well recorded classic/post-rock albums with the T-Peos, where the bite, aggressiveness, tonality of electric guitars can sound really great, but on the other hand recordings that particular suffers from being brickwalled I do have certain issues listening to.