My thought is, you are compressing your load with your bullet and like previous writers have suggested, get a compression die. You can get from Buffalo Arms.com.
You might try using a 24" drop tube when loading your powder into your cartridge. This will also help self-compress your powder.
I still would put in a .060" over the powder wad and then compress with the compression die.
For no grease grooves showing, 75gn 2F, try seating the over powder wad, .665" deep - that should put the top of the brass in the middle or on the front driving band.
