hi vali, i had problems similar to you, stutters and a general lack of smoothness on a pretty high end system. my solution is to use Simstarter NG, it allows you to set every single parameter
in the sim (and all activesky parameters) and save them to individual configs ready to run. for example: for night flight in the airbus you could reduce the unneccesary stuff (shadows, trees, reflections, water, less cloud layers and reduced cloud draw distance etc) and the resources freed up will give you more smoothness with dynamic lighting on.
feel like VFR in a prop plane, lower the things that you don't need for that type of flying and save as a new profile!
create as many customised profiles as you need and away you go.
it also allows you to play around with all the known config performance tweaks and save these to each config.
it really has been a gamechanger for me. i also notice you use DXT clouds, i find with my 1070ti that 32bit is smoother but no idea why!
all the best and good luck.