German players Ovtcharov and Baum actually switched their backhand rubbers from Tenergy to Donic Bluefire M1 which can make just about as high arc as T05. Bluefire JP series is probably a closer variant to T64 though(supposed to be a bit more speed-biased than M ver.), although both JP/M are much heavier than Tenergy if that's your concern. My guess is some pros with really, REALLY strong arm strength prefer something a bit better for looping on backhand and that's y they use M1, T80 and T05FX.
Tibhar Evolution series is also supposed to be Tenergy rivals and performs really decently in my opinion (also tried this 1 on my friend's bat), but again all Evolutions are much heavier than Tenergy, and the throw(arc) is much lower.
For me Andro Hexer/Rasant Series are the best alternatives. Weight is acceptable (only slightly heavier than Tenergy), throw is low but no trouble for looping, spin and speed for loops still very decent, plus short games are excellent. I never turned back to Tenergy after trying this.