Correct float and adhesive for concrete / durabase

[bigjeffuk]

Hi All. Ive done some research which has confused me more than when I started reading. So thought id post for some advice.

I have a poured concrete screed floor with UFH, its been down 18 months with UFH on low. The surface has been sanded as it had a sheen when it first cured. Im wanting to tile it (have tiled walls before) but wanted to do it right. As such ive purchased the tiles and membrane but have a couple of questions.

1. Theres quite a big difference in price between Mapei Keraquick Wall & Floor Rapid-Set Flexible and Mapei Rapid-Set Flex Wall & Floor Adhesive. Which should I be using and why? Im not averse to the cost if its necessary but I cant tell what.
2. Based on the above, do I need to mix in latex?
3. Ive bought durabase anti-fracture membrane. Can I use the same adhesive as above? with 3mm trowel
4. My tiles are 150x600mm food effect porcelain. what size trowel notch should I be using?
5. The screed is level, smooth, clean and dry. Ive washed it and vac'd it, do I need a primer or will I be ok?

I will be tiling at my own speed in small batches as I know the adhesive can set up quickly.

Thanks for the advice.

 

[bigjeffuk]

Took a guess and worked it out myself.

6mm square notch trowel that collapses to 3mm
Mapie primer G
I tried both adhesives in a test spot and were solid so went with cheaper one.
used the same adhesive for matting as well as tiles.
Did a test spot for the tiles, used same trowel and back buttered. Took tile off and had collapsed niclely with about 4mm of adhesive layer.

Cheers