Mark,
I have been using an R5014DPS RX in my 33% Ultimate Biplane with no regulator for 3 years with no problems.
6 HS 5945 s Ailerons and elivator
1 HS 5955 Rudder
1 HS 5925 Throttle
1 HS 625 Choke
I have over 175 flights in her.
I use an I4c products isolator ( no longer made ) on my Boomeang XL and my 40% Edge 540.
jef