Not sure how the UBEC factors into the equation. The motor will pull more amps than the esc is rated for. I think TY from Tekin knows what he is talking about and from my experience it didn't work well.

However if you like smoking esc's then by all means go with an RS and a 4pole.

To reiterate, the MMP or the RX8 would be fine (I use an RX8/4600 in my SCTE and a MMP/1410 in my Hyper TT)