I have just replaced a complete bathroom cabinet, countertop, and sink combo and replaced it all. The countertop and the sink are now one solid piece and it all looks really nice. I have run into a problem however, in that the house itself was never built very well. After securing the new countertop where it is supposed to sit. I discovered that while the back right edge fits exactly into the corner and the front right edge fits just against the wall where it should, there is a gap along the edge where the wall literally bows away from the countertop. At its widest there is almost an inch between the wall and the side of the bathroom counter. What is the best way to fix this?