Should you not do water changes when shrimp are berried? Or do you just mean that the excessive water changes are causing the shrimp to drop the eggs, not water changes in general?
You should. Won't make a difference. Just make sure the water you WC with isn't too far off from tank TDS/pH. You don't wanna use RO/DI water to straight WC a tank with 500TDS. And don't do more than 10% at once. '
I've done 10% WC's in my 10G tank with straight RO/DI water without berried mamas dropping eggs. My tanks are at ~180TDS.