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The thing that confuses beginners is this obsession with measuring everything to the nth degree - it matter not a jot whether it's a bit thinner, or a bit thicker the bees won't turn their noses up at it if they need it.
Beekeeping isn't an exact science - the bees make sure of that!!
Thing is that metric 2:1 (66%) is bang on the limit of solubility, so if you don't measure carefully, any error making it too strong is going to lead to complaints of "it won't dissolve' or "its started to crystallise".
Backing off to metric 60:40 (3:2) (or 2 pounds to a pint) means that one doesn't have to be so precise.
Basic rule - for immediate consumption (thus promoting wax-dawing for example) a 50% sugar solution is pretty much ideal for the bees to metabolise.
However, for storing, a stronger syrup makes the job easier for the bees, so they can do more, faster, with less bee-power being needed.
Give the bees strong syrup when they want to make wax, and they will still draw wax - the strong syrup just has to be diluted for consumption, which means nectar or water foraging, and a little less bee-power available for wax-making.
Trying to help the bees to do what they need to do is a worthy aim.
And to help them most for wax-making, 'thin' (about 50%) syrup is best. Whereas to help them lay down stores, stronger syrup (like 60%) is more helpful.
I dislike contact feeders - particularly for beginners.
Excessively strong (so crystallising) syrup plus a contact feeder is a recipe for "the bees have no stores but aren't taking the syrup". If you haven't heard it, you will!