The DNR ramp in port Clinton is a decent ramp, just a little longer run out to the lake, about 10-15 minutes of no wake, but it's free and no complaints about the ramp itself. This launch is on 163 and you come out of the Portage River.

As far as other options, I would caution using the ramps at Wild Wings. They're extremely steep and depending on your boat it may be tough to get it out on those. One of the ramps is also broken off which you may or may not see until it's too late. Fenwick has excellent ramps at the cost of a couple of extra miles of running on the lake. Both of them charge $10 per day and will put you much closer to the nether she of the firing range.