Nice results mate!!
So you are running NA 5efhe pistons at 18psi!!! Damn!!
I am going to build up a 1.5, with 5efhe rods, and 4efte pistons, planned to run about 15psi on a garrett T25 (later on a GT25R).
You had any experience of the T25 vs your GT28? How does the spool up compare?