i checked out the clip Narsh and they i like the warmth of the first cabs, they are a little too dark. the second ones are more appropriate for that style anyway.

you need to be able to tweak your amp and eq based on the cabinet sound in real time. not every cabinet works with every head. and not every good cab/amp/mic combo is good for a given style of music.

you already have your tone pretty close to cd ready, so the Epsi may not be a must-have device for you. for me, it opened a lot of doors tonally. there are lighter gain tones that have eluded me because the 11R cabs have too much bite, and i didn't know how to dial it out until i had the Epsi with Ownhammer IR's to compare to.