What is the wind loading in your area? You can find online resources to help you determine that. Here is a map that will give you a general idea:
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www.nrel.gov/gis/images/ ··· Wind.jpgTowers are subject to longitudinal bending and torsional twisting...something that you are concerned specifically about. You can combat this by using torsion arms on the 25G.
Lots of good discussion on this exact subject here:
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community.ubnt.com/t5/ai ··· p/360178