I'd be surprised if your loads are too hot. Both the Speer and Lyman manuals list loads well above 2.0 grains of Bullseye for the .38 S&W.
You don't mention your overall length (OAL); this is really critical in a small, short case like the .38 S&W. Are you using 148 grain WC's or SWC's? 148 grains is the usual WC weight. Wadcutters should NOT be seated flush with the case mouth in this cartridge, unlike the .38 Special.
I load a lot of 148 grain hollow base WC's in .38 S&W over 2.5 grains of Bullseye, but the bullet is only seated about half way into the case (OAL = 1.11 inches). I've never had a problem with this load in several solid frame S&W's and one Colt.
Sticky extraction in older revolvers is frequently caused by lead or carbon deposits in the chambers; sometimes this can be hard to see. I've solved this problem in some of my older guns with the Lewis lead remover. Sticky extraction is not a great indicator of excessive pressure in low pressure cartridges like .38 S&W because it usually takes greater than magnum pressure to cause it.