The problem with those triangular frogs is that they're not period.
Also, they're not adjustable, in that they hold the sword in just one position.
The double-wrap is closer to period, and usually you can play with adjustments on them. If you need to add holes for the belt buckle, that's easy to do with a leather hole-punch. They're cheap and easy to use.
BTW, the loops that hold the scabbard should have the upper one going to the front of the belt, so that it prefers to slant the hilt forward. It looks like you should be able to just switch them around.
Having the waist-belt nice and snug is good, so it doesn't move around on you, but like I said, if you need to add a hole to let it out a little, that's not hard to accomplish. Though I see you don't have a lot of belt left, sticking out of the buckle.