Sorry to necro but been doing research, if you use the double attack and assail method here is the minimum tone you need to do x number of extra hits.

0 hits - 1728 1635 - 1 hit 1560 - 2 hits (I gave up here, at 1550 it turns to 3 so you can probably go lower a lil before it requires more)

Jumped down to 1475 and it took me 4 hits. I might come back and perfect these numbers but ughhhhhh it's tedious. Memory address is c6 - c7 if you want to mess with it. It's in little endian so c7 is first half of the number c6 is last.