Hmmm..... I am currently at this time playing this level. Your best bet would be to use either the Spy or Heavy class. You'll beat him. BTW, watch out for X1's lightning pillar!
Seems like it's all coming to an end.... I had waaaaaaaaay too many donuts.
for PSP I have three different classes set up a regular one Blaster rifle, pistol, Thermal det.
explosives rocket launcher and OS.
close quarters shotgun and stun baton or electrostaff
the other stuff is completely up to you.