It sounds right, but i'll try to suggest you do it this way, and avoid double ground connections to avoid ground loop.
In st51.
Connect PIN1 of male xlr on your mic to 4th pin which is where tightening screw of the XLR is. This way you grounded the body. Make sure screw is tightened, and has good connection to the body. Connect pin1 also to ground of the pcb. Connect capsule backplate to pcb ground, don't connect it to the body. Make sure diaphragm wire is connected to the right side of coupling cap. In the past i made mistake and connected it directly to the fet. Positive lead of the capsule should go the side of the cap that is not connected to the fet.
Check if the transformer is connected right. Primary should be connected to ground and coupling cap, secondary which goes to xlr should not be grounded!
Go through this schematic, it is basically the same as st51. Check if everything is where it should be. Check continuity with a multimeter.