Mambo, "bout ye!"
I'm hoping you disliked
@Localtiler's post by mistake as everything he pointed out is vital to a successful instillation.
In this forum if you ask in the right way you'll get all the correct advice for FREE that you could possibly ever need, we are a very welcoming and helpful bunch!
Starting from the top as you put it.
1mm grout gap isn't enough on top of a heated screed, 2mm is stretching it. A tile display in a shop is a different beast altogether than your actual circumstances.
What if any expansion joints and where have you considered putting them?
+/-3mm floor is poor for a 1200mm plank tile, clips are a serious help to achieving a lip free floor.
By what means did you take the moisture reading?
If the floor is fully commissioned as per manufactures recommendations then be sure to follow BAL's instructions as to the correct procedure for tiling on a screed with WUFH, don't be afraid to call their tech dept, here's their number 00441782591120.
A 10mm notch won't give you 6mm bed depth, flat skim the back of the tile and the trowel the floor in a single direction and your adhesive bed depth will be more like 2/3mm. Personally I'd go with a 12mm notch for that tile.
Your clipper won't be much good to you on these tiles except for small checks, you'd be better off with a decent manual cutter and an 115mm angle grinder with a good blade.
As for not seeing the point in primer, well where do I begin, is the screed a calcium/gypsum based product?
In what way did you hope a laser was going to aid you with this installation?