Control click and drag controls with buttons and knobs

[lxne]

Hi, I am trying to manipulate some click and drag controls (primary color wheels in Davinci Resolve) with buttons and knobs (in my case with a Loupedeck Live).
For that, I try to emulate mouse commands (click on a wheel and drag the mouse).

With the following snippet, I can position the mouse cursor on one of the four color wheels by pressing a button.
Off course, the values depend on the screen, but I don't know of any better way to position the mouse.

hs.eventtap.leftClick({x=150, y=770}, 100000)
hs.mouse.absolutePosition({x=120, y=920})

The first line makes sure the color wheels are active.
The second command places the mouse cursor on the first color wheel.

Now I am trying to make the click and drag commands with two knobs. One knob for horizontal and another for vertical adjustment/dragging. Unfortunately, I can't get it to work.

I thought, with each step of the knob, the control point of the wheel would be dragged into the corresponding direction.
For example, to accomplish correction to the right, I tried the following (doesn't work).

pointNow = hs.mouse.absolutePosition()
hs.eventtap.event.newMouseEvent(hs.eventtap.event.types.leftMouseDown, {x=pointNow.x, y=pointNow.y}):post()
hs.eventtap.event.newMouseEvent(hs.eventtap.event.types.leftMouseDragged, {x=pointNow.x+1, y=pointNow.y}):post()
hs.eventtap.event.newMouseEvent(hs.eventtap.event.types.leftMouseUp, {x=pointNow.x, y=pointNow.y}):post()

One big problem with this is, the wheel gets reset with a double click. And that's what's happening with this snippet.
If I turn the knob pretty fast, I can move the mouse, but else this is not working.

Any ideas would be appreciated.