you dont need to fill all your weapon slots, those weapons are just a mess together.
repair drone and diamond shell is a good match so keep it but ditch the majority of those weapons for smaller set of weapons which compliment eachother well.
I'd say ditch the red rain, keep the orb and get a rear hit heat and a side wepon with knockback
EDIT: if you really want to use some amo weapons I dont recomend using a load of bullet and a load of rocket weapons, you're going to be sacraficing a lot of mod space for amo. it can sometimes work but it needs to be really well thought out.