Granada Caliper help

I have the granada swap that was done about 10 years ago from a kit I bought from California mustangs.

I went to have my rotor turned and replace the pads. First problem was that the piston was so far out that both pads wouldnt even fit in the caliper. So I removed the bleeder valve, forced the piston all the way back in and that freed enough space to put both brake pads in(Now the piston was so far down that the surface of the brake pad was below the cliper itself). Once both pads were in, I tried to slip them over the rotor. The gap inbetween the brake pads is about 1/8 inch smalled than my rotors. I ended up having to put my old pads back on in order to get it to fit over the rotor.

My question is that these are a floating caliper? Mine appear to not be floating as well. the floating section that hold the outboard pad doesnt seem to want to come out to give me that extra slack. I see a slightly wedged shape tab with a allen head screen on it which looks like it has something to do with how the outboard half of the caliper moves in and out. Is there something I can do to free this up or am I better off just getting new calipers too? My pistons are not seized and there are no leaks so I dont want to replace them unless I have too.

I attached a picture of the wedge shaped piece I was talking about.

I got the piston in far enough that the inside pad was below the inside lip of the caliper(in other words, the rotor would hit the inside of the caliper before the pad). However the outside pad was not out far enough. Any idea how to open it up any more? pushing the piston in further wont do much since it is already in all the way. I need to spread the caliper apart about an 1/8 inch more and then everything would fit.

yeah they look identical to my originals, and they fit in the caliper fine, just not enough clearance to get them on the rotor. I thought the amount of lining on the new pads was alot, there is almost 3/8 to 1/2 inch of lining on the new pads. went to another store and compared with a different brand of the same pads and same thickness of lining. my current old ones have about 1/8 left.

both pads were correctly seated. In fact I had he piston pushed in so far that the inner pad was below the surface of the inside of the caliper thus taking the inner pad completly out of the equation. The caliper appears to not be as wide as it used too.. its a floating caliper so even though theres no piston on the outer pad, the whol caliper should move in. It doesnt appear to be moving back out all the way.

I havnt had time to look more into but Im gonna take another look and get a granada manual so I can see how that caliper works. there is some type of clip with a spring (circled in the picture attatched above) that has something to do with the way it floats.