Tyro,
I would suggest that you make sure there is equal pressure in each toon. The way I check it is to fill one of the toons to desired pressure and give the toon a thump. It should make a ping sound. Then fill the other to desired pressure and give it a thump. Try to get the ping sounds at the same tone or pitch. Also, you might look at how each toon is connected to the frame. Make sure they are both the same distance fore & aft. I would think that if one of the toons is slightly ahead of the other, that might make a difference in tracking. Hope this helps.
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