Hi Radek,
I guess all current servos with similar specs are power hungry ... the power must come from somewhere, after all.
Currents you can manage, a good BEC and a buffer battery or other buffer solution.
Savox are 'known enemies' and they work very well. With yet unknown servos or servos where not that much experience exists, you're exploring new terrain.
I can't take the decision away from you
Eddi
Born to fly ...
forced to work.