That's honestly a tough call. If you went to all the work of growing/harvesting/storing, I would just give it a go and see what happens. I've found teas can be a little misleading sometimes, because they're not seen against the malt, and as you say a boil might smooth things out.
It also depends on the level of grassiness, too. I once had a (purchased) pack of Saaz that smelled like the underside of a lawnmower, and I briefly thought about not putting them into my carefully planned Bohemian pilsner. I put 'em in anyhow, and sure enough...the end beer smelled like the underside of a lawnmower! Those were genuinely grassy hops, with no redeeming qualities...I ended up dumping that batch.
So my thought is (without smelling the hops myself) that you put a ton of effort into the hops, so should give them a try. If they were purchased, I would ditch 'em (because that's a relatively cheap loss, versus homegrown hops).