A couple of things.
1) Why are you slimming down in the offseason? I know being in high school and a little pudgy is a pain in the ass, but the offseason is the best time to bulk up and make some gains. In season, you're not going to bulk up . . .I playted at 5'7 195, and by the end of the season, I'd be down to 175 without fail, and usually a little weaker, even though my lifting stayed about the same.
2) West Side would probably be good, but if you're a lineman, I think Waterbury's TBT would be solid. You don't need to worry about your speed quite as much . . . though, if you do go that route, make sure you're getting some football related off day work in. Run your rope course, sprint hills, run bleachers . . . it's all good. Just make sure your feet don't get slow.
5) Cleans are also a great exercise, so it's good you're focusing on them. And, if you have it in your weight room, make use of a machine that is sort of a standing bench press . . . it simulates the burst off the line pretty well. We got one my junior year in the offseason, and I felt like it was a nice addition.
6) I'm serious about not slimming down in the offseason. Bulk up. I go to Virginia, and our guys do all their building then, and then just do maintenance work inseason. Football kicks the shit out of you, and lifting sucks, before or after practice.
Good luck man. I hope all goes well for you. If you lift right, you can be a solid player, even when you don't have the natural athleticism. I sure as hell didn't have it, but I worked hard and somehow managed to start at center at my size.