The stiffness is okay, if you have a proper seating position. For normal chair use they are too "steep" which causes extra stress on the foot. Also you should use your whole leg to press down the pedal - not just the heel resting at the base and the toes pressing, that's insane. If you actually put on shoes it gets much easier to press, and heel-toeing won't hurt anymore either.
But to be honest, I much preferred the feel of my squashballed MS Sidewinder pedals. They were actually progressive, with no resistance at the beginning, up to impossible-to-press-to-100% resistance at the end. The G25 pedals just have a strong resistance all the way down, which feels less real to me.
I might find something that I can lodge under the front of the pedals (the end that is nearer to me), so they are at a better angle.