I'm not sure what you consider low-riding, but Gary Brommeland makes a thin, comfortable IWB, the Max-con V, which is my all-day, every-day carry set-up for a Glock 19. The longer I wear it, the more comfortable it becomes. Here is his web-site:
Holsters Concealment Systems Gunleather Concealed Carry for Weapons
He and his wife are both happy to give you as much help as you need over the phone.