Really great work, both to you The DB & Marconi!
Always in the past, (and ANECDOTALLY?) after a rather large number of antenna swaps I've helped with, we'd see right about 1 s-unit of loss in performance from swapping from an Imax to a MACO V58, conversely, about 1 s-unit increase when replacing a Maco V58 with an Imax, some of which were done shortly after the disappointing Maco was initially erected.
Also anecdotally(?), it's been my common experience to see about the same amount of improvement (1 s-unit) when switching from an Imax2000 to a Penetrator or other full-length true ~22.3' 5/8, but never have I had the chance to utilize an Imax radial kit.
HOWEVER,
...and I'm coming clean here,
I did see a little improvement over the Penetrator when I erected an Imax in it's place and added FULL 1/4 WAVE downward diagonal (45° - 70°) radials which I made from guy wire, attached to the bottom U-bolt on the Imax, and terminated to parachute cord the rest of the way down.
I haven't been comfortable posting this until now, but in this new light of a corrected-phase 5/8 radiator Imax, you have me rethinking those results which I simply wrote off at the time to either odd unpredictable conditions, the Ustream meter/ receiver being dinked with, or some other unknown physics-pseudo-reality occurrences...???
Please, you can understand, after so many years of seeing the same end results in so many differing installations, I couldn't believe an Imax could ever even keep up with, let alone BEAT (BEST) a full-size metal 5/8 Penetrator.
...and it DIDN'T! - Until I added the FULL 1/4 WAVE 4-wire diagonally downward counterpoise system.
OK, so THERE'S one for you'ze wize guyz 
to model.
All were erected atop a grounded 41' high mast and NON-isolated from the mast, nor was any coaxial choke employed. Just a simple, quick & dirty install.
The 4 guy wires on the Imax were 108".
The results I got was to a local Ustream meter, right at 10 miles away.
OK, I'll look forward to seeing some awesome graphic models 
