Jammin X-1 CRT motor selection

I dont mind spending the money on a Lehner if it is worth it. I hate buying cheap and then eventually ending up replacing it a few times. I'd rather get something good and it lasts, however if I do, I want it to work on 4s and 6s. If the 8xl or 9xl will work good on 4s, it's a no-brainer.

Glassdoctor, what is your opinion on running the lehner on 4s in delta configuration like mentioned above?