I would like to get som recomendations for what servos to get to my new 2x2m patterplane. I now have a 90size patternplane with digital JR8301 on all sufaces

Same or similar to: DS8231 Digital Ultra Precision 1.76 oz (50.0 g) 0.73 x 1.52 x 1.32 in,(19 x 39 x 34 mm) 88 oz-in (6.4 kg-cm) 0.22 sec@ 60 deg Coreless, nylon gears, Dual Ball Bearings $129.95/$99.95 comparable to JR4131 .

I will only use digital servos. pref. JR I have heard that several use the JR DS8401 and 8411 (8511). approx 11-15 kg. Should I use 2 on the elevator or one, should the Rudder servo be more powerful?

I am also considering the OS 140 rx with a OS tunedpipe and header, pref. 2strokes, other reliable options ?