im losing fish over this knot....im tying braid to mono using the improved clinch knot, today i lost a pretty big bass over this knot when i go to set the hook the mono snap at the knot is it the knot or what im using 15 lb powerpro braid and 14 pound

A blood knot will stop your line from breaking.

http://www.animatedknots.com/bloodknot/i ndex.php?LogoImage=LogoGrog.jpg&Webs ite=www.animatedknots.com#Bachmann