Honestly you guys have to decide what you want to target and what technique you want to use when you come to Erie. Later in the month of april will get you some more stable weather. Most guys I fish with this time of year jig fish which is 90% males.
If you are targeting big pre spawn females I would tell you to pick last 2 weeks of March or first week of april. When the percentage of pre spawn females out numbers post spawn. Now with that come a risk of more unstable weather.
If you just want to come and troll and catch fish I would tell you come june throu September and fish farther east and fish ports from lorain to conneaut. But lots of variables play in to that also. Have had many days in the past 2 years of catching over 100 walleye in 3 to 4 hours.
You have to take into consideration we had large hatches in 2014 and 2015 of which fish will be in the 17 to 23 inch range. We also had a mega hatch last year which was the largest in the recorded history. What does this mean to you guys is lots of smaller class fish to contend with. All in all erie is a very special place but weather can wreck havoc on a planned trip… trust me I live 45 minutes from the lake.