Velox rim tape is great. I don't use tire liners. I will make a boot if I have a cut or puncture in the tire and don't think it needs total replacement.
Having a problem with double flats suggests to me that you're either running over a lot of stuff you shouldn't be running over (glass, etc.) or you aren't inflating your tires to the correct pressure. Hit one good hole with too low pressure and you're asking for a double pinch flat.
I use "race" tires all year and generally don't have problems. When dealing with road salt, gravel, etc. I will more frequently inspect for cuts and debris stuck in the tire.
Another common cause for chronic flats is having a valve stem hole that is sharp. This would tend to promote ripping at the valve stem attachment to the tube. It's not easily fixed with rim tape like sharp spoke holes, for obvious reasons.



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