I actually made a list of changes I would make to an updated PSO for fun. It covers mostly weapons currently, but one of the universal changes I would make is to make weapons that can't combo stronger. In terms of damage, they can't compete with weapons that can combo.
Beyond that, I'd be OK...
I always liked the Rianov 5. I have a thing for piercing weapons, and I find the RIanov 5 to be the best of them due to its power, range, and fast projectiles. I only wish it comboed.
If you have one of these, PM me or hit me up on Discord. My Discord ID is in my sig.
EDIT: No longer interested in this. Sorry to all who contacted me.
Looking forward to seeing the end result!
If you're looking for other ideas for pieces, how about adding various NPCs, like Principal Tyrell or Red Ring Rico?