Remaining weapons that could use a buff?

IMO:

The Therapist stun bomb launcher feels woefully undertuned when used normally. There is apparently a technique to make the stun bombs stack (something about spinning 360 to break lock before firing) which triples its power, but I'm unsure if its healthy for a weapon to rely on such a thing to be good. I'd prefer if either the bombs always stacked and were balanced accordingly, or never stacked and were given a meaty buff.

The Ransetsu-AR automatic rifle (NOT the Ransetsu-RF semi-auto rifle, that thing is yummy) also feels badly undertuned, and I haven't heard of anyone finding a special use for it like the Therapist above.

The Chang-Chen machine gun is in a better position than the Therapist or Ransetsu above, but I feel it could still use a bit of a boost to set it aside from the Ludlow. The larger mag and ammo reserve don't feel like a fair trade for the higher recoil, lower sustained damage/impact, and longer reload to me, not to mention the Chang-Chen's higher weight and EN-load.

Haven't played with all the back weapons enough to have a firm opinion on all of them. Are niche weapons like the giant VE-60LCA triple laser cannon or the EULE shield launcher doing ok?