1 1/2# pull on a shotgun?
I don't get it. Totally different solution to the question "What's the best way to get a projectile to the target?" When you're sending one projectile long distance, that 1 1/2# trigger may be an asset (rifles to hundreds of yards, pistols for target purposes)...but with a firearm sending a cloud of lead to the target, under 100 yards?
That being said, in the Brownell's Q&A for this product, they even give an ambiguous advisement against using it on anything other than a slug-only shotgun.
I'd buy a whole new trigger group from Remington, then have someone competent stone the engagement surfaces for you.
Then mess around with the spring set-up.
Jon