Hi Simon, sorry I can't help with the levelling lamps (sure someone will be along shortly) but I changed my 17" serpents for 16" unions as I needed the extra comfort and it was noticeable.
Going from 15" to 17" will definately be a different comfort level but it will feel more planted.
Good luck with your upgrades.
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“Time flies like an arrow. Fruit flies like a banana.”
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