Like others have said, I like the bit you have.
A little curb pressure gives you finesse and a horse that breaks at the poll. I find that snaffles make the head go up before they collect and go down again. But maybe that's just me.
Sometime I should get a picture of the mechanical hackamore I ride in. Everyone seems to dislike them or think they are severe, but I don't find them a drop more severe than a mild curb bit. Basically, it rides just like a curb bit.
I do make a couple modifications however. For instance, I always take off the wicked looking curb chain that comes with them and replace it with a flat, double linked curb chain. And I always use a mechanical hackamore with a gentle, wide, flat noseband. And I ride on a loose rein and neck rein, only actually using rein pressure if I need to control speed (not usually an issue). But basically, it rides like a curb bit.
My new Fox Trotter rides best in a mild curb (similar to what you posted a picture of) or a sliester mechanical hackamore with a flat noseband and flat curb chain. She actually does better with both of these than she does a snaffle. (She doesn't seem to like a bit with a broken mouthpiece). I even gait her and use two hands with the mechanical hack. She puts light nose pressure into it and gaits just great that way, the same as she does with a curb.