Switched one of the slides to a non-captured guide rod with 19 lb spring.  Test functioning showed a slight rearward travel of the slide when the trigger is engaged to the point right before it breaks.

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Tried the this recoil assembly on two other slides and one other frame (and it different combos) and the results were the same.

The slide does go back into full battery when the trigger breaks.

Is this normal for a lighter spring do this?  Does not do this at all with the stock captured recoil springs.

TIA

The Glock striker spring opposes the recoil spring when in battery and the sear engaged with the striker.  The recoil spring pushes forward on the slide assembly and the net effect of the striker assembly pulls backwards on the slide.  The stock recoil spring is usually much stronger than the striker spring. You've reduced the force pushing the slide forwards, and now you're evidently at a point where the completely-compressed striker spring (right before trigger break) is nearing a balance point with the mostly-uncompressed recoil spring.

You can get rid of this issue by reducing your striker spring or increasing your recoil spring... but it's no big deal.  At the moment of breaking the shot, when the sear releases the striker, there will no longer be a rearward forced applied to the slide assembly because the only spring pressure on the slide at this point is the recoil spring pushing forward.  This is why you see that slight reward travel disappear when the trigger breaks.

Is it the full size or compact?
What led you to the decision to put a lighter recoil spring in it?
What kind of ammo are you mostly going to shoot?

Well dang that was a heck of an explanation.....thank you.

The slide is a longslide from Brownells.  Will most likely use some moderate power handloads as I plan to use a compensator as well to make an informal competition gun for our shits and giggles club matches.