Yummo! Looks delicious. It's not really ricotta, but quarg, or quark. I made both ricotta and quark at a cheese making workshop a couple of years ago. I prefer quark as it's much more versatile.
Carine I use a slotted spoon to take the curds out with my ricotta. It's easy to get most of it out gently then.
I haven't tried this, but when my mum makes TM ricotta she makes a double batch with 3.5L milk (heating up 2 batches in the TM). She includes 500ml of the whey drained off the first batch in the second batch, and usually this is sufficient for the curds to form without adding vinegar or lemon juice. Mum swears this makes the ricotta smoother and creamier. Now I'm interested in trying it myself!