use the same load and just seat them deeper, velocity would probably go up a tad and pressure go down by just giving them a lil jump.
I don't follow the logic of that. If he uses the same load - showing at this point two classic signs of overpressure - and seats the bullet deeper, he is burning the same amount of powder in a smaller space. That would result in higher pressure, not lower. That little jump to the rifling may not be enough to lower pressure if the real cause of the pressure signs is another factor.
Pete