IME, it`s more like than not that a symbiotic goby and a pistol will pair up, eventually if not right away...
I used to take a pop bottle bottom and carefully put the goby, trapped in the bottle right on top of the pistol cave...
3 out of 5 times this would work right away.
I`ve also had tremendous luck by having just the two animals in one of my aquapod 12`s or the 5.5 nano I used to keep.
I find that as long as the two can easily find one another, they would rather pair up than not.
Coolest set up I ever saw for pistol and goby pairing was therealbigals 12 gallon aquapod where he had a mated pair of yasha`s and 3 pistols all living together....though eventually one of the pistols died.
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