Originally Posted by
Foggy_Goggles
Yeah, you are gonna have better luck with that Henry 695 (or similar) with the longer open time. You are only gonna need a quart. The spec trowel with be 1/8 V notch at the biggest.
A couple other things. Check your layout for your finishing row. I see a full piece starter which makes me think you just went for it. Take your time. Start straight, stay straight. With wet set adhesive it can feel like you are working on a skating ring. For the first few rows, either dry set first, remove, then spread adhesive, or glue each piece one at a time.
Quality counts. Its a small job. Details matter. Make it awesome.