My master head evacuates faster than it fills. It is a fresh water fed Gallemaid setup. Because it flushes faster than it fills, it takes a big gulp of air which requires a bit of burping to get it to evacuate again. Not a stator issue as she flushes just fine until she empties the bowl and sucks air in from the empty bowl. Is there any way to increase the fresh water flow rate or decrease the flush rate. Not a big deal but ther should be an easy answer. Local wrench has suggested closing the discharge sea clock a bit to slow the flush rate. That does not seem like the right answer. Any ideas?