If it were me, I would add the fish in this order
1. Goby/PS
2. Jawfish
3. Pseudo
The Pseudo's are territorial, and depending on which one you get it might chase the pistolshrimp each time it sees it come out, thus creating stress. You might actually consider another fish.
Jawfish and a PS/Goby combo will do just fine. Adding the jawfish to the opposite side of the tank will be a plus as well. I've seen a tank (KevinPo's) that has both in it with no problems. Its actually entertaining to watch the PS try and steal the Jawfish's LR rubble and the Jawfish defend itself. Speaking of which, you might want to add a bunch of LR rubble, about the size of each fish's head to let each help build up its burrow.