We hope you are enjoying it here on YT. I think being consistent with potty breaks is key. Make sure they go out shortly after they eat. If they have a favorite spot to go potty, take them there. It does take awhile. I trained Calleigh to go on the pad and outdoors. She uses the pad when it's raining. She's a fair weather potty goer.
I'm sure you get frustrated. They will learn. I should imagine it is harder training two dogs at the same time. Know that you are not alone. You can vent on here any time.