Glad to hear you figured out that problem! For 17mm hexes, Traxxas makes their own set now and they seem pretty solid. If I still had a Revo and were looking for a 17mm hex setup, I would choose the Traxxas ones.
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz