I think the velocity did drop a little, of course, the voltage drop would effect the dwell? I didn't consider that, with the IR3 just a project marker, I was only concerned with it firing!did the velocity drop at all, from the original setup.?
It's hard to know how it would perform against a datum as without eyes it's limited to 15bps by the board. (I will fit those eyes one day )
I also have a CP fore reg fitted and run it on HP at the bottle so it's difficult to know how much difference each change made.
I can only confirm that the noid cycles ok on the lower voltage and that in laymen's terms, it seems to shoot well. Air economy etc I can't comment on. It's a suck it and see thing I think!