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I leave mine set at 1.8, after nearly 2 years of trial and error I find with this particular machine it's a pretty safe bet. I also live in a humid environment where filament can tend to swell.

I...

I really have no idea to be perfectly honest. Like yourself, no manuals anywhere or troubleshooting guides so just trial and error when I came into problems.

I bought a reel of Crystal Clear ABS...

Yes, as filament has a variance. I personally set mine to 1.80mm as I found setting it to 1.78 gave me alot of clicking and filament slipping problems.

If a corner is warping, and then you turn the model and print it in a different direction, does it still warp in the same corner? technically it should, which would be a slightly unlevel hotbed.
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Sometimes 110c is too hot! drop it to 105c and see how you go, also you could be printing too hot - drop the nozzle temp a little too. If you print too hot, when it cools to 110c its warping because...