I've had O2 eliminators on my 08 for a couple of years now. No PC fitted, no other engine mods and I do believe it makes the bike run better at low revs. Mind you, so does a good SV balance. And it's a very subjective assessment.
I'm going to try the ignition ON/OFF/ON thing mentioned above and see if that makes a difference to the quiet spot ~5krpm.
Tried it, twice, this morning, before & after refuel on the way to work (35 miles, town & highway). Whilst I'm not 100% convinced yet I'm pretty sure there is less of a "lack of drive" from 4500-6000-ish rpm. Certainly in 6th gear, the roll on from ~5krpm feels smoother and more linear.
Surely it can't be that easy?
I'm going to carry on trying this for a few more days then revert back to normal start procedure and see if I can spot a difference.