My thought is that if you liked your old Asolo 535s, why not get another pair? I think they'd be fine for that part of the world, even for much longer trips. Or, you could try Asolo's new boot, the FSN 95 GT ($150), which has been wildly popular as both a day hiker and backpacking boot. I tend to think the Montrail Vercors ($190, but discontinued despite frequent glowing references to it by Yours Truly) may be a little heavy for you, although it's a fine all-around boot. The warmth issue is neither here nor thereby the time you don socks and all-leather boots, your feet are going to heat up, regardless of whether the leather is 2.4 mm or 3 mm thick.
You might also look at another Montrail boot, the Torre GTX ($150). It's a nice, mid-weight hiker along the lines of the FSN 95. But, like the FSN 95, it has a Gore-Tex liner, and I would think that could definitely lead to hot feet. Best, perhaps, to go with something like the AFX 535 II or the Vercorsa straight-up leather boot without a waterproof liner.
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