I ran a 23/81 on the 7.5 in my B4 and it was a nice, comfortable speed outdoors. I would if anything gear down for indoors rather than outdoors.
crank up the timing to level 8 if you want more speed. I use to run mine on 8 all the time until I had to run the 5.5 everywhere and it got turned down to try and calm it.
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