Kevin
I have a customer we put 8x A700 in a CARF Pitts S12 with a Moki 300, we have been giving it some for over 4 hours flying now with no issues! Powerbox Royal SRS supplying the power. He also has a 3.3m CARF Yak 55 that we swapped out another brand of servos and the feel was improved.
Don’t see an issue if you use decent wire.
Dave