Correct me if I'm wrong. RoMedic = Autopots right?
I've never had an issue with players using autopots but here are some ideas to throw out there.
Packet Obfuscation? (rAthena and Hercules emulators)
Disable pots in PvP?
HaShield?
Really depends if you are willing to spend. If you want a free solution, then try Packet Obfuscation and GRF Encryptions (no connection to WPE). Just another layer of security.
If you have some bucks to spend, I would try HaShield over Harmony. Harmony, afaik, only supports up to 2012-04-10 clients. HaShield is decent though and fairly cheaper compared to harmony resellers.