Pokeypokey, and then abuse the DPS of 7HMG. Only 4t of ammo needed at MOST in solaris, so the rest of the tonnage is put into target info gathering (also skill for this). Doable without mishipeshu too, use the P RA and a PRIME RT. Your ERPPC will be torso mounted making you less good factory's vertical levels.
Of course, though it'll be hard to get in HMG range and you'll need more ammo. Maybe something like this:
you'll get some tonnage back from that so might be able to upgrade the single ERPPC with some SRMs on the side or something, many SHC run 2HLL 6(L)MG. I think it'd do pretty okay in scaring Piranhas away and if you do get in brawling range it's unsurpassed DPS