I have ridden a 154 3” turbo doo the last two years with 5 psi boost at 8-10,000 feet. I would say it really depends on your goals, riding style, snow conditions, terrain, boost level, etc. If you are trying to outclimb your buddy then I think that you bought the wrong sled. 154 3”looses a lot of forward drive traction with wheelie. To keep the front end down when climbing you have to have the rear super stiff, mid shock soft, limiter tight. I just don’t find the sled as fun to ride that way as it takes a lot more input. Good luck even with those settings keeping front end down on something real steep. 165” NA sled will climb as good in lots of situations mainly due to keeping the front end down better.
I normally run the rear softish, mid shock medium, limiter loose, Skis medium. It super playful and re-entry city that way. I like it in a variety of snow conditions. 180 lb rider weight with gear. If you ride steep trees it can be too much wheelie and not real controllable so I will tighten the rear if trying to climb steep stuff in control.
I would be curious what other people would say.