Currently, in a lobby with 2 Helis who already have FnF missiles taking all the kills before anyone else can get any. I feel like this is intentional by Gaiijin to force people to GE parts as there is very little you can do to stock grind anymore.
Edit: I know how this game mode works, I have grinded out the parts for 80% of the helis in the game.
You can always go after bases and capture points. Put on some good music and grind it out. It does suck with that heli though, the rockets are kind of crap against bases.
You have to realize one thing:
If you have only 100 points after 10 min and buddy has 1000, you still get half his reward.
So if you are on premium and he isn’t, you earn the same RP.
As you said this helis rockets suck for bases, it takes around 8 mins to kill a single bases with reload stat maxed, which gives around 150 score, + time taken to get to the base, and if other people are going for the same one you might as well not bother. In that game I was working with the Mi-24 so e can both cap the point at the same time as you both get the max 120 score if you do so.
This is to grind the parts not to grind for other helis, I always play with at least a 200% booster or greater on and get around 15k RP + per 30 min game.