Desperation Attacks

So I was wondering, would there be any way to change the odds/chance of performing a Desperation Attack so that they happen more frequently?

Original code:

Code:

C2/15E9: 20 5A 4B     JSR $4B5A   (Random number 0 to 255)
C2/15EC: 29 0F        AND #$0F    (0 to 15)
C2/15EE: D0 20        BNE $1610   (1 in 16 chance for DA)

Beside Gi Nattak solution, for simply increasing the odds, you could do a AND #$1F instead of the AND #$0F that is there . This would double your chances (12.5% instead of 6.25%).