Back to the timing discussion; The rv allows us to close the intake earlier than pp, helping with blow-back, increasing the ratio of starting volume of mixture in the case vs pressurized volume when the transfers open, and the time it has to pressurize. Jennings mentions that "curiously, the best port-closing timing for a wide variety of disc-valve engines is about 65-degrees after top center".
It also allows us to open the intake earlier, even before the transfers close. I'm wondering what detriment, if any, there would be to opening it up even earlier, up to 180°, or whenever case pressure goes negative (and reeds would open) between there and the transfers closing. Jennings touches on this, in the rv section, and the dutch seem to push the overlap past the recommended 10°. Seems like it might help with the port-stalling. Of course the only real way to find out is to start cutting on my stock crank a bit at a time and trying it till it gets worse...some things to do before I can commit to that.
My cycle as it is:
Intake Closes - 57° ATDC
Exhaust Opens - 95° ATDC
*Blowdown - 24° (95° ATDC - 119° ATDC)
*Crank Pumping - 62° (57° - 119° ATDC)
Transfers Open - 119° ATDC
Intake Opens - 132° BTDC (228°ATDC)
*Intake-Transfer overlap - 13° (132-119 BTDC / 228-241 ATDC)
Transfers Close - 241° ATDC (119° BTDC)
Exhaust Closes - 265° ATDC (95° BTDC)