Unity 3d | Gravity scale value varies for different device resolutions. So gameobject not reaching to specified height for all devices

Question

I am developing a 2D game where i throw a gameobject vertically upword direction using AddForce api. Now as the gameobject start moving upword due to force applied, i keep on increasing its gravity scale from 1 to specific value (say maxGravityScaleValue )in Update(). Once maxGravityScaleValue is reached, ball falls down. I developed game using reference resolution of 1080x1920. For this reference resolution maxGravityScaleValue was 960 (i just fond it out by trial and error).So i thought it will be consistent for all devices.However later when i tried my game on various mobile devices the maxGravityScaleValue was varying inconsistently for different devices. I am sure For every device unity is doing some calculation to determine that max gravity scale value. I tried many calculation but no luck. Please help me to come out of this situation

As the gameobject has to go vertically upword and fall under gravity after reaching specific height, i will give Y coordinate of gameobject, height and maxGravityScaleValue for different resolutions.

1. Resolution :1080x1920 (aspect ratio 9:16) , maxGravityScaleValue :960, gameObjectY : 375 TargetY : 1440
2. Resolution :1080x2280 (aspect ratio 9:19) , maxGravityScaleValue :1440, gameObjectY : 555 TargetY : 1620
3. Resolution :1125x2436 (aspect ratio 9:19.5) , maxGravityScaleValue :1200, gameObjectY : 608.62 TargetY : 1718
4. Resolution :1242x2688 (aspect ratio 9:19.5) , maxGravityScaleValue :1030, gameObjectY : 671.25 TargetY : 1896
5. Resolution :1440x2560 (aspect ratio 9:16) , maxGravityScaleValue :850, gameObjectY : 500 TargetY : 1920

Game Object thrown vertically upword using AddForce. Should fall down after reaching TargetY. My logic is to increase gravity scale from 1 to maxValue when force is applied. So once maxGravity value is reached, Gameobject should be at TargetY and from there it should fall under down.