I would recommend rinsing your rice if it’s coming out gummy:
Put some water in a bowl with the rice (just barely enough to cover it), stir it with your hand, drain, then repeat a couple more times.
Be careful when you’re pouring out the water as you can accidentally dump the rice, too. I usually try to intentionally get the rice to bunch up in the direction I’m pouring, then pour it over my hand slowly, so I can catch it if the rice starts to fall out.
The first rinse will usually be milky as there’s so much free starch in it. Later rinses will become more clear. You can then use a strainer to drain it fully, or decrease the water slightly to deal with the extra water.
(Although it’s basically 1:1 when cooking in a non-jiggling pressure cooker, you also need just a little bit more that leaks out until it pressurizes, but if it’s still coming out gummy, you can try reducing the water slightly)