I'm assuming you've checked for spidermites. They'd start causing yellowing on the leaves soon, though, as would a lack of nitrogen. I notice all kinds of wierd stuff with potato leaved plants, and I only get concerned when things get REALLY out of whack. It's possible the plant is getting a little too much nitrogen, as a deficiency would show first as yellowing...I know that distorted leaves on peppers can be a sign of excess nitrogen, I'd think that would apply to tomatoes, as both are in the same family. Like I say PL plants do wierd things, and sometimes it's best just to wait and see what happens.
Fruits is fruits...
you're doing something right!