X/Y aiming consistency help

[torpid basin]

Hey I've been trying to solve this issue for a while now, the goal is to have a grip + posture to reset to that I can consistently move my mouse with my arm up/down and left/right in as perfect in a straight line as possible.

I'm trying to achieve this because i cant find a perfect position that arm movements left/right are straight but then up/down is off, then with up/down is straight then left/right is off. I believe achieving this will give me constant consistency example if I see a target I'll know exactly how and where to move my mouse to be on the targets head. Since its off, im obviously compensating for the sensor orientation.

I tried so many things, different ways to grip, different mice, different posture, more/less forearm on desk, Raw accel sensor rotation, Struth gaming clawmates (made worse but potentially can make it better in theory), the only thing I haven't tried is buying a height adjustable desk because it feels like my current desk is slightly too high for my arm to be 90 degrees but I think its at least 100 degrees.

from my attempts to solve this i found 2 things that help, putting my ring finger on the right mouse button along with my middle finger then only aiming with thumb and pinky, but this gives less snappy flick control.
Also gripping the mouse with 2 fingers on either side (thumb and pointer on left with ring finger and pinky on right) to "level out" the mouse so its facing fully north, then switching grips but i quickly lose the consistent X/Y movements

Is there a solution or any advice or could this be a human limitation that we need to compensate for? i dont know, or maybe my desk is just slightly too high that makes it off?

[charred marten]

Hello fellow perfectionist. I've been through all of that but I have an adjustable desk as well. I even went to check whether my mild scoliosis is the root cause of the issue and worked with a chiropractor. While I'm actually very happy that aim training led me to improving my posture it didn't help with fighting the issue completely. But I probably got rid of the issue for like 80%. What helped me the most:

1. start with the shoulder position, it should feel nice and relaxed. Having it in line with your body is a great starting point
2. place your forearm on the desk, i'd say around 2/3 to 3/4 of it is a good starting point here
3. test for yourself whether you like a flat or neutral forearm position. Keeping it neutral is more ergonomic, but for me it gives me terrible strain on my shoulder (especially rotator cuff) and my lat, so I keep it in a flatter position. See for yourself
4. desk height mostly impacts how much friction you have with the pad. What works for me is when I'm in my comfy starting point the pad slightly rubs against the forearm, and the friction eases as I go to the top part of the pad, but the forearm still remains in contact. If it lifts - you went too low with the table, if it's sticky - the table's too high.
5. Now load up into any practice range and start swiping like you would clear angles. See if the crosshair drifts. Visualize it going straight and ask your body to do what's necessary for it to actually go straight. The mouse grip will change on its own. Remember the feeling of that grip and try to replicate that

Some tips:

1. keep a light grip, since tension in fingers can make the mouse rotate inside the palm
2. slouching will make your table height feel off and your forearm will stick to the pad
3. rolling the shoulders as you get more tired progressively will offset your usual forearm position and can make the grip feel weird which will make you readjust your grip to the one with skewed sensor position