well one model cant fire at 2 different targets. i think you should read the codex.
well i would skip bonding and upgrade one to shas whatever. and rapid fire is 12" 2 shots not half the distance.. read the rule book.
well they hit faster and harder than the orks but i think you should max this squad and just fire with it. keep it in the woods for higher surviveability.
well 4 is not that good of a number. max out on kroots instead.