Surface mode issues with missing parts

[LainSzvahl 0]

Aloha folks,

                 Im having abit of trouble with Surface modes, im loosnig out on details if i have Normal/Both set on, But if i have surface on

it keeps my detail but pretty much screws up the model like not printing Top surfaces leaving big gaps ( seen in pictures ) ive been

experimenting with settings but still alittle new to the whole thing, Basically im trying to get those Details printed out like i have

on the example model i did with surface mode set to surface, those small rails on the model do not show up on a model with Normal

or both turned on and it also feels hollow,i do have print thin walls set all the time. So if anyone could shed some light to help i can provide gcodes or even profile if needed.

Im, just trying to get prints with all those details on, Some pictures below from slicer and actual model.