I think I've mentioned to you, HHG, that I've never been on a side with such overpowering magic dominance. It was striking to me how unbalanced that was, and how crucial to the Lizards army. We got off several important spells when we needed them and, conversely, blocked several Empire spells they really needed.
I think the Krox are a mixed bag. They're not cheap, and they're relatively vulnerable. On the other hand, S7 is mighty. I hear you thinking about a big block of these fellas, but I'd suggest that several small, 3-man, blocks would be extremely effective. They have decent movement, which would allow you to get them to where you need them, and as smaller targets, would provide less-juicy magic and shooting draws.
Skink cloud was okay. It did the job - slowing up enemy advance and showering targets with poisoned attacks. However, a more mobile list (say mine, for example) would eat those blocks at a rate of 3-4 a turn. I'm not convinced they're that effective.
Which leaves us with the problem of where to put core points. I know you're reluctant to use Saurus, but they are quite excellent against low T troops, and they'll stick around to pin an enemy in place. I imagine that 4x20 saurus could provide a lot of the same interference the skinks did, while having more backbone and filling that core requirement.
Flyers. We wanted them. A hero on a terradon would have been awesome.
Etherial Slann... worked exactly as we hoped, against this list. A bit fragile on his own against characters armed with magic (again, thinking about my list - a captasus with sword of anti-heroes would kill him in 1-2 rounds of combat). Still rather see him surrounded by TG
Chameleon skinks - I wish we'd had some in the list. They're so damn good!
Tetto-ekko was amazing. Worth all the points and then some. I don't know why you wouldn't field him every game.
Other skink priests were basically item-holders. The cube was definitely worth taking, but these points could be spent on flying heroes. Tough choice.
Overall, I think the list did what it was supposed to, in your capable hands, HHG.