I am new to the whole external wastegate and blow through system and need some advice please!!

I am thinking about changing the springs in my wastegate and bov...

I am looking to run 24-25 psi on pump gas on my 57 trim (I have head studs for extra safety) What spring is recommended? I just have whatever spring came with the Tial wastegate from Tial.

My 50mm Tial VTA BOV is fluttering ALL of the time under boost and the Tial Sport rep said that it is not normal and I need a softer spring.. so which one is recommended for an Evo?

I really need some help ) :

THANKS SO MUCH!!!!!