Should gone for the accufab, my experience with the 75MM was constant bogging out, like a vaccume leak. SO I upgraded to the 70mm, it ran much smoother. Professional products arent all that great IMO Id return it and look into brands like Accufab, you can feel the quality just by picking it up. Accufab products are built right. And theyre customer service OWNS PP's.Ok, went with the 75mm. Should be here later today. Ill let you know what happens.