Ti. retainers are a wear item and should be checked every 10k, does not matter the brand. For a high boost app use a spring setup with around 80 lbs seat pressure. Ferrea is a very good valvetrain as well as supertech, and omni. Skunk2's new pro series stuff is also really good.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.