Na, +1 is right. It can be +1-3 I believe, but the grind post 900 is a little harsh. This is pretty standard for Destiny.Yeah I could only find a helmet that was 1 level higher than my previous one. Surely weekly bounties are meant to drop more poweful gear than that?
I just made a new character with New Light. Maybe it has messed up the progression somehow.
You will get there sooner than you think, though. So unless you're hyper focused on getting into a raid asap, I would try not to worry about it.