Try this as either a temporary fix or you may just decide you like it better anyway.





LT + RT (hold LT first, then hold RT) This brings up the Left side of Xbar 3 (or whichever xbar you choose)
RT + LT (hold RT first, then hold LT)This brings up the Right side of Xbar 3 (or whichever xbar you choose)

I like this setup for all my Classes/Jobs but is especially convenient for Smn/Sch since tapping the RB brings up the Pet Hotbar anyway.