The supplier of your slip may have a tried and true glaze that will fit onto the slip you are using. This may be the way for you if you are not confident in altering glazes/clay bodies.
hit the crazing button above left to see the discussions around this prob. You are not alone.
If you keep just trying at random it could get expensive. AND you will be more frustrated. Talk to your supplier.
The issue, as addressed by JB, won't go away without testing and altering.