Loosening Up

I've been using Harrington on Hold 'Em as my guide book for one-table SnG's, and I've been doing fairly well. However, I've been having trouble adjusting it for larger tournaments. Harrington suggests that I loosen up and be more aggressive as I descend into the Yellow Zone, and one-table SnGo's make this easy. As the blinds go up, there are also less players, I will have position more often and, more importantly, I will be in mid-/late position with no one entering the pot yet. As such, I'm raising far more with things like A8 from "first" position (which is now two off the big blind).

However, in larger tournaments, I'm having trouble knowing how to loosen up properly. The problem is that I can't figure out how to loosen up properly when there is still a full table.

What hand selection should I use when I'm entering the yellow zone, but I'm still at a full table? I know Harrington suggests dropping suited connectors and 66-. Should I then be raising with 77+, any two face cards and ace-anything? What cards should I call with?

Any advice would be appreciated. I'd like to be able to play at full tables with a lower M.