Just find out there's a tech trap after JFT (where you can do it twice and left ukemi) take this combo for example:
CH 33B 2143B:B JFT 2362362365 Grab. Tested on Pyrrha, Cerv and NM (S/M/L hitbox) - if opponent is very close after JFT, 236 is enough - max range x3 is good.
Edit: most likely...