Speed to me depends on what your flasher or dodger is doing. Keep an eye on your tip and adjust your speed so you get a nice pulse on in. Remember the flasher is also their for sound. As far as leader length I go for 24" OF 50lbs for bait that doesn't have its own action to 15-20lbs and up to 60" for bait that has its own action. Hope these help along with the other advice.

Tight lines

Kevin