Joel what is the net valve lift on the intake and exhaust? That thing has a lot of seat pressure (like 305ish) and at .725 assumed gross lift you are at 673psi over the nose of the cam with about .080 to coil bind.

Out of curiosity what size are the valves? If your Ti intake valve is, for example 90g vs. 140g for SS valve how much can you take off of the spring rate...that is the question.

Food for thought...your current spring has a listed weight of 152g. Can you find a spring with comparable IH and spring rate that has less mass to control aka lighter? The accepted theory is lighter = more RPM so you would think moving in that direction will produce your intended results. Maybe we should be comparing the gross mass of the valve/retainer/spring/lash cap combo instead of just the spring vs. cam.

This is a very interesting topic to me as my new beater -1 combo is using 2.25 Ti intakes.

Sorry for geeking out on you lol