Has anyone ever experienced a slow draining tub in the aft bathtub aboard a Hunter 450? The drain itself looks as if it's intended to limit the draining speed / volume so as to not overwhelm the sump pump. We are aware of the strainer -filter in the sump pump box. The plumbing beneath the tub is almost impossible to get to without cutting a new inspection port to access the underlying plumbing to the tub drain. Looking for anyone that may have had an issue in the past and what remedies they've come up with. I'm thinking of up sizing the pump to discharge faster.