Combo unlocking Cannon Rouge is not a good idea imo. Banana Cannon was not designed for rangers to use. Iron faust is limited to cast. Weapons shouldn't be exactly the same across the spectrum or else you just end up with a clear 'best' option and it gets very stale. If you want a good AOE bazooka weapon for ramar/ramarl, consider hunting a Bomb-Chu in the upcoming Triforce event. It is quite strong on them. It uses card animation so it's actually pretty fast to attack with, and has insane ata so it basically won't miss either. The different classes can use similar gear if you look for it, but the unique differences of individual weapons within the variety of gear is what actually keeps things interesting.