I can't believe all the fear about 'banana' bales. You should empty out the bale chamber and inspect all the hay restrictors and dogs that form the bale. You will find dirt, stones, a poultice of hay chaff, mold, rusted through ramps and misadjusted tension springs. Clean the chamber out and sharpen the knives while you are at it. The feed rate has nothing to do with a misformed bale. Lastly, check the tension of the twine as it comes out of the twine box. If its too loose or tight on one side, it contributes to the internal compression uniformity in the bale. If nothing else, count the threads on the hay restrictors at the back of the baler. If you have a lot of difference between them, that won't compensate for other asymmetries in the holdback process.