Adjusting Serpa drop leg holster
 

I'm trying to figure out how to raise my drop leg to sit higher on my thigh. I have the two belt straps synched as high up as they'll go.
Any suggestions would be lovely.

Aside from modifying the straps you could try spacing them further apart on your belt. If you want a permanent solution, find someone who does clothing alterations and get them to sew the straps to your desired length!