As part of our home renovation, we moved the location of our master bath toilet and installed HET flush toilets. To move the master bath toilet the contractor/plumber changed the angle of pipe under the bathroom floor (draining the master bath toilet) from a right angle to about a 15-20 degree slant. Now when the toilet in the neighboring bathroom is flushed, the masterbath toilet sometimes splashes and bubbles. Do we need to rip out the walls and redo the plumbing or is the outflow on the Toto Drake HET toilet so strong that it's worth trying to install a non-HET toilet to see if this problem gets fixed? If this is worth a try, any particular toilet we should try? THANKS!