Wall anchor won’t go all the way in tile

Installing a grab bar. I followed instructions and made 5/16” holes, but maybe I should made slightly bigger holes for tile? I guess these Hillman Duopower #8-12 contractor strength anchors are mainly designed for drywall.

I tried hammering them in, but they won't go in any further. These are almost impossible to take out now...Should I still try to remove or cut off and use anyway, since they seem so snug?

Installing a grab bar. I followed instructions and made 5/16” holes, but maybe I should made slightly bigger holes for tile? I guess these Hillman Duopower #8-12 contractor strength anchors are mainly designed for drywall.

I tried hammering them in, but they won't go in any further. These are almost impossible to take out now...Should I still try to remove or cut off and use anyway, since they seem so snug?