Four Winds dwarf kaffir lime tree

I bought this 1 yr old. Xferd to larger pot (10"dia x 10"dp). I'm at 8K ft in CO with plant in a south facing bay window. It gets 5-8 hrs of sun, at least 4-5 direct. Going strong. Even has a single lime! ...which my 4yr old CA plant never did. So, I'm not complaining. But! ...have a weird thing occurring. About 30% of the leaves are curling under, longways. ????
My CA plant never did this. This plant has no mights, scale, aphids, or any pests I can see, and I look closely with mag glass and know what to look for. I have one of those water meter thingies, but don't really trust it. I keep the indicator at jes below the "too much" red. Only one leaf has ever fallen and none are yellow. It's in the best organic potting soil and gets worm guts plant food every other watering. Like I said, growing to beat the band --two new sprouts-- but older leaves still curl under. I keep it jes under TOO wet, cuz I want it to have a juicy lime fruit, of which I've never had. OH, if this helps, all the onther limes fell off when they were jes pea sized. I figured I wasn't keeping the soil moist enough, so upped the water scheduale. This one lime is the only one that has survived and is now lrg jawbreaker size. I got the plant mainly for the leaves, an herb in Thai cooking, but would love to get an actual kaffir lime.
My primary worry is, WTF iz it with the curled leaves!?
nb
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vi --the heart of evil!
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A string of cool temps can do that. And bay windows often don't get as warm as the main living area.
Kay
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This IS in the main living area and the bay window IS the key source of light/heat during the day. It is cool at night, getting down into the mid 40s (F) outside, but the house is never below 60F.
The leaves do not appear to be unhealthy in any way, jes curly. ;)
nb
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