For what you're doing with a 3.55 gear I'd keep it in the 250-255° @ .050 and .575ish lift.
Can step be milled off? I'm not familiar with that piston.
Like I've said before, I'd drive it as is and see how it felt. If you want to step up the power later start collecting parts and have everything ready when you get ready to make the change. There will be a high cost to pick up the little power you're wanting.
