I moved an existing toilet about 4' to the left in my bathroom. The vent pipe was located directly to the right so I moved vent pipe directly behind the new toilet location and spliced into the existing section in the roof. So I have a 3" waste line to a sanitation T. Top of T feeds to toilet and back of T feed vent pipe. Toilet does note flush well and gurgles a little at end of flush. Anything listed above causing issue? Picture attached. Thanks for the help.