OOPS! I fear I have damage my credibility.

Sounding like a job for my gunsmith....in Mercersburg PA!

Give Jake a call at Accuracy Speaks in Arizona. 480-373-9499. They sell a kit for reducing the trigger pull on 870's. I used their service for lightening my trigger on a Rem. 760 and it worked great. They were great folks to deal with. You won't be disappointed.