In my own personal experience, here are the top five factors for trolling success for Erie 'eyes

1.) speed
2.) speed
3.) speed
4.) speed
5.) everything else.

Again, my own personal experience and opinion is the wrong crank bait trolled through a pack of 'eyes will always out catch the "right" lure trolled at the wrong speed.

A small selection of DHJ's, P10s, and/or RRs coupled with mastering speed and depth will get you 80% there. Then after you've mastered speed/depth control fine tune the color, style, and wobble will get you the next 20%. I learned the hard (and expensive) way that if you are trolling and not catching anything it's probably speed more than lure.

Again, my personal opinion/experience.