Your creases look pretty good.If you want a deeper crease try and little more weight before turning up the heat.
Keep your temp low and test on scraps and bump it up slowly until you get it right.
Curves are harder to crease. I tip mine forward and go backward around curves.
What edge paint are you using? I've tried Fenice, Stahl, Fine Leatherworking and BuckleGuy. My favorite is Buckle Guy. I'm not sure who manufactures it but I suspect is Giardini because it's from Italy and not quite the same as Fenice. But just a guess.