According to my driller, you have several factors to consider. If you don't lose inertia by changing weight, go for it.
I asked him about dropping to 14, and he felt I'd lose just a little - so it wasn't quite time yet.
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-- "Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming,
"WOW! WHAT A RIDE!"
So far, I'm on schedule.