Indeed I do.
Which is why I've got G4 between every state change... just didn't write them down earlier. But since someone may stumble across this in the future, here's what worked for me to get the fastest orient sequencing with 100% reliability:
G64 P7 (tristate)
G65 P7
M3 S300
G4 P0.5
M5
(no G4 needed after M5 for my particular roller-bearing spindle lock. It can handle the spindle still being in <slightly> in motion.)
M64 P4 (spindle lock)
M19 R0
M65 P4
M5
