Interesting, those temps sound ideal.
I would say the asian style ones seem to like more heat but should still be just fine.
There are many OP varieties, and they should produce a decent crop.
I guess you like the more tender texture of the long ones. I like a big of thickness because of the way I use them, but certainly that tender texture is useful in many dishes, especially those that are quickly cooked.
Some other things that come to mind are: eggplants love water, soil should be moist all the time for best fruit quality. Which brings the problem of verticilium, they are very sensitive to it, if there is suspicious wilting, it's most surely verticilium.
And then pruning, I saw various ways, but most people start with 3 stems (around the main branching that happens near the first flower). Then depending on variety and support, you usually leave only those 3, or you leave some more up, but in a way that makes a somewhat aerated bush (so branching leading away from the middle).
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