Beast fly pretty wind resistant and pop lips are pretty heavy. I think it's more fly line taper than leader. What wt and style of fly line are you using. Heavy flies I use a 10wt with either a Rio OBS intermediate or a SA Titan floater. Either one my leader is as follows..3ft 50lb mono, 2 ft 40lb mono, 1ft 30lb mono with a small spro swivel attached. Tippet for heavy flies at night would be maybe 2ft of 40lb mono, loop knot to fly. You want the leader to mimmick the weight and taper of the front end of your flyline to carry good turnover.