I also use a pressure cooker, and use the same process, only mine is a stove top cooker, and I use the low pressure setting. Even works for eggs fresh out from under the hen.
If I want soft boiled I cook them 3 min. to 3 min. 30 sec., depending on whether I am using my tiny PC or the larger one. I then run the pot under cold water to stop the cooking.
I also poach mine in those little silicone tulip shaped poachers, in the PC. I do the them the same as soft boiled eggs and they are perfect every single time. terry r.