Sorry for the short reply, was on my phone earlier. Fair enough I see your reasoning I just shy away from short ranged weapons without ablative wounds to cushion them.
Also 2+ saves arent allowed in KT just fyi and fleshbane is only in CC not ranged now (unless your using the older rules which I prefer too).
However you can use rending on splinter cannons, preferred enemy too. Splitfire is another nice one on a 6 shot weapon so id suggest any of those instead just depending on what you want to tailor to.
Then I would consider putting a blaster/heat lance on a bike and/or changing the blasterborn into lanceborn and giving one of those tank hunter/PE.