I've got a couple of inkbird PIDs that I use regularly. I haven't had any issues with either. You'll want around a 6" thermocouple, and an SSID with a heat sink to handle the load circuit.
One of the lovable quirks about the 88!
If he hasn't already, cleaning and greasing the sear surfaces helps. DO NOT TAKE APART THE TRIGGER ASSEMBLY!!!
Because of the difficulty in assembling everything again, a trigger job is going to be pretty spendy. They can usually be brought down to...