Combines chaff heavy on left

if you find the answer to this mystery, let me know. got a customer that had the same problem in wheat this year with 1660. wish i could help more.

talked to mechanic today,only thing we could come up with is that I plugged rear beater up an made a dish or bend in the bottom beater plate on right side,thought maybe it was holding the straw back and then shooting it out in clumps when it got enough.tried straghtening it but was in a hurry did a half n%$ job dont know if it helped or not,10 acres left then i will think about it over winter!

hillside dividers help and are cheap,if you dont have them.

I have the dividers they work great, we dont have much of it but this is completely level ground.it thrashes just fine but looks terrible behind combine.