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Yeah both blades I have are dry cut for porcelain specifically. I think a large part of the problem is my FIL’s angle grinders has been used and abused and the bearings are a bit knackered so the blade’s chattering a bit.
I’ve hired a bridge saw for tomorrow as I can’t keep a straight line with the angle grinders, so we’ll see how I get in with that.
Trunkie-
20mm is thick though. Maybe wet cut would have been better, I find wet cut keep the dust down which helps my concentration. A steady hand and grinder are essential, not always easy if you're working at ground level.
I'm used to hiding as many cut edges as possible. Trying to make them look like a machine cut edge is beyond anything I've ever achieved.
Airhead
There are different designs of tile cutting blade, some are designed to work wet, others dry. Some suit stone more than porcelain. Have you looked at the design of blade you're using to see if there's something more suited to the tiles you're cutting?
I would say a little bit of chipping (shelling) of the edges strikes me as fairly normal. I use a file that's normally used for natural stone to dress edges occasionally.