I think that if the Red Sox were too far out to make a run, they would have some decent trade chips. That in mind here's what I would do. I would trade Papelbon and V-Mart. At the deadline these two players should bring back some good talent. Some GM will be desperate, always is. Also put Cameron, Beltre, Lowell and Ortiz on the block. See what there is and if it can net something of worth pull the trigger. I also call up SD and Milwaukee and lay the ground work for a Agon/Prince deal. Getting a deal done by this TDL seems iffy. But at the end of the season they should have a good head start.
Now into the off season. Acquire one of the aforementioned first basemen and sign them long term. With the trades at the deadline, the Sox should have enough pieces to make an enticing offer. Sign Adam Dunn. 3/30M I would wager is a deal he would be intrigued by. That adds some much needed thump to the lineup. To balance it out I would kick the tires on Jayson Werth. And if it is reasonable bring him on board. These three moves, although complex would instantly change the SOx lineup. Run prevention will be a thing of the past. Not saying it'll be easy or anything, you asked for a plan and this is what came to mind for me