Looking for saddle blanket with built-in wedge

Right now, i'm using a square cut-out saddle blanket with a built in wedge but my trainer said that I need a blanket without the cut out. It's not fitting paul the correct way and keeps sliding backwards with the saddle. If I ride without a wedge, the back of the saddle sits way off his back. If you have any other suggestions for getting the saddle to fit better, I could use them. Thanks.

Nvm. Sorry, I read your post wrong.
Pads aren't supposed to cure your saddle issues, you know. ;)