I found the const acceleration after an age of trying to use the point gravity but thanks for getting back to me. I have no plan to release to phones, its PS4 and Steam only. I need to have more of a play with the GPU particles but I’m think it may be too noisy for the games style. I will definitely look into it more though and see if I can get something that has a nice balance. You will be happy to know I have swapped over to GPU for the snow however and its really ramped up the blizzard so I can get a good range of weather in the arctic themes 
Thanks again for all your input!