I think you made a good call, Rob.
The 4311 is an excellent AVR with a more robust amplifier topology/design than the majority of other receivers. For those coming from lesser AVRs, there can be a noticeable difference moving to an amp. For those with top-end AVRs, the difference is minimal, if any. If you don't need the extra headroom, your Denon will treat the Ascends with the finesse and control they deserve.
Happy listening.