Region3 detecting parts by selection box and not hit box

I have a region3 and I want to detect parts in it, which work fine but i only want to detect parts physically and not by the parts selection box.

I have an example here

the red box is the region3 which is not touching the slope physically and the blue box outline is the slopes selection box. The region3 still detects the slope which I don’t want as they’re not physically touching.

Is there a way to fix this, thx in advance

You could possibly change where you obtain the Part’s size by not making it 0.50?

local MinSize = Part.Position - (Part.Size * 0.49) --Or something along those lines
local MaxSize = Part.Position + (Part.Size * 0.49)