I'm running a push turbo with mpi's intercooler and fuel pump upgrade and no head shim. For fueling I'm running a power commander 5 with autotune from pyschosled. I love
the way my sled runs now and I would recommend looking at a pc5 setup for your sled too. While I only run 12lbs because I need injectors to run more plus I have no head shim so running more would require straight race gas anyhow.
I would also take a look at what's available from evolution powersports. From what I understand they can take the stock ecm and program it to run bigger injectors and start, idle, etc. just like a stock sled. Sounds like their fuel controller is a nice option as well.