I started off using UltraTile Proflex SP adhesive with a 10mm notch trowel and back buttered each tile - this method does use more adhesive but it ensures maximum coverage and no hollow spots. The only issue I had was I ordered rapidset which only has a two hour pot live and the anti-slump property was quite harsh to the point I struggled collapsing the ridges - maybe a 20mm round trowel would have helped but I really weren't fussed on the product. It is advised to lay two rows and allow it to set for half hour, this will create a foundation to work from and prevented the tiles moving away from the line when I continued pushing new tiles up to them.
I was happy with my first attempt at tiling but I hated the rapid-set adhesive and reached out to Mapei technical for advice again

I was looking for a slow-set adhesive that supported large format tiles, they introduced me to Keraflex Maxi S1 - such a good product, really nice to work with, 8 hour pot life and overall ideal for my needs.
The 8 hour pot life give me plenty of time to work with any lippage issues or cuts without rushing, it's also worth noting that I ran the ridges against the tiles to make it easier to collapse them.
I marked out the rows to minimise mess, it's surprisingly easy to miss judge the sizes when spreading the adhesive.
Tools of the trade:
The step
The floor by the step was slightly uneven as I never leveled that far up.
I tapered a small piece using the wet cutter and it actually worked:
Perfectly level
Then grinded the step face down in preparation as it wasn't flat - this is now ready for when I start tiling the step + utility room.
Finished kitchen (pre-grout)