I need some help!

[John]

I've built four cbgs. Three of them are completely built by me, while the fourth has a neck from delta groove. Two of them have a fender strat scale length, while the other two have a 24.5 inch scale length.

All of them play in tune while I use the slide...except...when the string starts to bend downward. If I lose the slide, and try to play holding down the notes...everything is out of tune. 

However, if I go back to slide, and play softly without causing any string bend, the tuning is fine.

I've tried everything I can think of...and im lost! (And very discouraged)

If anyone knows what I am doing wrong, I would greatly appreciate the advice.

Thanks!

John

[Uncle John]

Good deal on probably figuring it out.  Over and out here.