I have recently gotten my cwp and have been practicing my drawing and acquiring targets. When drawing my xd9 subcompact from my crossbreed and galco stow and go I find myself putting my thumb on the rear sights to draw (as it seems way more comfortable). I know I'm supposed to get a full finger grip but it seems I don't have enough room for my thumb. Any tips and or ways to practice? Thank y'all in advance for the great info!