Take one out at a time starting with the middle one.
Here are the steps to go by redoing the LOWER headbolts, not uppers as they are ok.
1) Drain coolant from motor as BEST as you can. The more gone the less chance of having a leak. If possible, unscrew the drain from block on the drivers side, under the car on the side.
2) Pull out middle headbolt from one side
3) Spray brake cleaner in hole, use air compressor or let air dry to dry out the holes. Make sure not to use too much air since it may splash coolant back onto the threads.
4) Use a generous amount of ULTRA BLACK RTV on the head bolt threads. I HIGHLY recommend this stuff because I had a problem with teflon products and this stuff sealed it NO PROBLEM!
5) Torque directly to your torque setting whatever that may be. No need to do it in steps this time.
6) Continue this procedure for the rest going from the inside bolts, out.
Let the car sit for a couple hours to make sure the RTV drys well and start it up. Keep an eye out near top of the headbolts for leaks.
Shouldn't have any problems after this as I followed this same procedure with no leaks and 8psi of boost!