Boost valve only works when the shock is set on the pro pedal setting, so if you run it open most of the time as I do it make absolutely no difference. The pro pedal stops the mid stroke wallow and helps ramp up towards the end of travel, going from 150 to 175 shouldn’t make a lot of difference imo, you could always change the air can size to compensate. I was running the shock in the lowest pro pedal setting and didn’t realise it was actually on for the first 3 months of having the bike as couldn’t tell any difference between on and off in this setting!! Yeti ASR-5 as well. I got the kashima upgrade and is well worth it, I had the shock rebound slowed down as well at the same time. The rear end is so buttery smooth and thats with 1 seized bearing in the dog bone!