Won't explode unless you feed above 30% impurities. I don't typically worry about pressure; leaks are predictable and allow you to get an exact match on the leaking element as long as the element strong to it isn't used.
For fotia gorget specifically, light/dark conflict so if either leaks you'll have a tough time balancing them. So, I would do:
Purge impurities before feeding anytime they're at least 26%(most feeds give 5%). Feed fire to 40ish, so any leak will be fire. Feed light/dark to 20, if you don't get them both within the 18-22 range give up and restart. Feed fire up to 60ish (it'll be leaking by this point). Feed earth to 50ish. If you go too far over, use wind to correct(each wind feed will take 2 off earth). View readings on fire leak until it hits 50, then end. If it's already leaked below 50, just throw a fire feed and wait until it balances.
Results don't seem to change based on how much charge of elements that aren't required has been accumulated, so the water from the fire leak and the wind from correcting earth don't hurt anything.