The Tapco grip you are trying to use is not a SAW AK grip. It is the FAL grip that came off the stock set. It will not line up with any trigger guard. The hole pattern is different on that grip.
The hogue grip's screw hole is set back further than standard AK grips. To use it with any trigger guard you must enlarge the screw hole on the grip towards the front to line up correctly with all Saiga 12 trigger guards.
Yeah, i saw that. But after playing around with the screw and trigger guard by themselves, it seems as though (my eyeball estimation) the screw that came with the grip is too l