Once you establish your time, and the images on the contact is similar then you do not need to do test strips, If you are light or dark by a bit its no big drama.
the idea is to just print... free yourself Willy.
Ha! I've gotta admit that sounds fun and liberating and I probably could make a hundred prints in a day this way. I need some more 8x10 paper soon anyway, so I'll see about bigger boxes for my next order! Cheers