Help, please! What are we doing wrong..

[bsc ceramics]

12mm ???😵

 

[Rosa]

Bsc..yes 12x12 mm notched trowel...why?

 

[bsc ceramics]

just looks smaller by the photo

 

[Rosa]

Really? I don't know why that can be, the consistency and 45 degrees are there..but i'll double check today.
Thanks for mention it

 

[Dumbo]

I've never seen a 12mm v notch before . Who's make is that .

 

[Rosa]

It's Genesis 12 mm square notched. What do you use for 600x600?

 

[Rosa]

That's how is like..

 

[LM]

That's how is like..View attachment 97956

What type of adhesive is that you’re using?

 

[Rosa]

This one Lee, the one they have at the shop.

 

[LM]

This one Lee, the one they have at the shop.View attachment 97957

That is actually a very good adhesive and recently it’s formula has been upgraded to S1.
If sufficient notch size has been used (in this case if it appears that it is as you have 25ish ribs across a 600 tile) then poor coverage issues normally arise from an uneven substrate (which I’m assuming it’s not) but sometimes the tiles themselves may be ‘dished’.
The adhesive in your picture doesn’t appear to me to be skinned as it still appears wet. Try back skimming the tile in the same direction as the floor with a 4 or 6mm notched trowel also.