30/40 points is nothing if it makes all your other stats by 20+Well, unless your new equipment is like 30-40 points higher than the old one with the bonus, lol.
I haven't gotten too far yet so not sure. I do know you can lock certain pieces when equipping stuff so you don't accidentally unequip it, heh. You can also Fuse equipment to try and get gear with the skills you want.
And yeah, you have to plan, there's no way to keep skills on characters.
Super important thing about fusing - when a skill name shows in blue on the fusion screen it means that the old skill in that slot will be overwritten and lost. Yellow means added/upgraded stuff. I lost one Union because I didn't notice that at first.