Gentlemen,
Last night I tried out another combination of my freakish mod. This time it's re-foam-filled Redondo with trimmed bumper. (Note: I have tried trimmed bumper without foam before.)
The result? Great! Nice thuddy and headlight.
The foam pellets added back the mass to the racket (otherwise the racket will be lighter due to the trimmed bumper), but distributed the weight all the way from the handle to about the 9&3 area along the shoulders. Beyond the 9&3 up to the head-top, the void is so small that there's only a very small amount of pellets getting in there. I noticed this when I removed the top grommet while the pellets have been filled a week earlier. No (or may be just very few so as to be negligible) pellet fell out of the racket.
The handle has been moded a bit too. Since I got the pallet for the 4 3/8 grip, I'm now using the thinnest Pacific replacement grip plus two overgrips. I lost the bevels a bit but no problem. This made the racket about 11-12 pts HL I think (haven't done a precise measure).
I think I now have my always-sought-after racket. This setup plays about 90+% close to my beloved Dunlop Revelation Tour Series 90. I may have to reduce the tension a bit (now @ 62, nylon, strung 3 hours before play on a constant pull) to make it play easier and a little softer, to close-in on the feel of the Dunlop.
However, last night was my off day as I'd been doing some heavy home-improvement job all day and was a little worn out. Still, I could play decent enough to say that the mod and setup was "just right". My down the line BH's were nice and parallel to the alley. I really did enjoy playing it.
And, importantly, it's a safe Redondo. It's unleaded.
Cheers!