On my phone it’s incredibly small. Hopefully it’s bigger so you can see it better.
Your overlap triangle is that triangle in the middle where the exhaust is closing and the intake is opening. That’s overlap. Both valves are off the seat at the same time.
Where the exhaust closing line crosses the intake opening line is always at max valve lift at overlap.
Think about this. Valves open more flow more. That’s basic. So how far off the seat at TDC the valves are and WHERE that occurs relative to TDC is critical.
If you blow it up and look at the TDC line you can see with your 110 LSA and 106 ICL the triangle is shifted to the left of TDC. That’s because the cam is advanced. And the intake valve will be open sooner and be further off the seat before TDC.
If the cam was “straight up” at say a 108 ICL both valves would be off the seat the same amount and that would occur at exactly TDC. And your overlap triangle would be centered over TDC.
This is generally where engines make the best power IF the headers are tuned and the LSA is ground where it should be.
If the cam was in at say a 110 ICL it would be retarded and the overlap triangle would be shifted to the right of TDC.
I’m just using those numbers as examples.
Right now you have the numbers at 110 LSA and 106 ICL and it’s advanced. That’s the 4 degrees you’ve entered where it says advance.
To move the overlap triangle just change that 4 degrees in the advance box to 3 degrees and you can see the overlap triangle either get centered over TDC or it will at least move to the right a slight amount.
Keep lowering the advance number by one until you see the overlap triangle centered over TDC and when you get that number that’s where I’d install the cam.
I’m not sure without doing it myself where that would be but just play with it and see what you get.
Edit: I just used your numbers and it looks like to center the overlap triangle you need to be on a 108 or a 109.
I can’t tell for sure because it’s so small on my phone I can’t see exactly where it is. But it’s either 108 (plus 2) or 109 (plus 1). Plus 4 is definitely advanced.
Play with it a bit and use different numbers and see how the overlap triangle moves around.
One interesting thing I’ve found is most off the shelf cams that call for a plus 4 install don’t center the overlap triangle.
The math I use always centers the overlap triangle regardless of what the LSA/ICL numbers are.
For example, the math might call for a 110 LSA and a 107 ICL but when you use MGI speedware even though the overlap triangle should be advanced it always comes out centered.