Can I raise the power level of Gunsmith faction rewards in Destiny 2?

I just got back into Destiny 2 after a long hiatus and am re-learning a lot of the game’s systems, probably a lot of questions to follow! But today’s question:

When I raise my reputation level with Banshee-44, is there a way to increase the power level of the rewards? Or is this just a way to basically get base-level legendary weapons to pick and choose the rolls I want to sink resources into upgrading?

For the record, some (probably related!) stats:

• I’m power level 1298
• All my Banshee-44 rewards are 1266 (so not much use to me unless I feed them)
• I’m at level 34 reputation with Banshee-44

I have plenty (I think?) of resources to level up reputation: about 2700 gunsmith materials and 300 weapon telemetry data, so I could get several levels up. But I don’t really want to do that now if I’m just going to get low-level weapons. I’d rather grind up to the season level cap and then worry about sinking resources into the stuff that I want to use long term. But if there is a way to get myself some nice, immediately usable guns that I’ve missed, that would be great!