Seems like it's similiar to UAG case then, for gaming and 3d I'm using external fan to get better performance, so it isn't much of an issue, for normal browsing/writing/drawing I don't see any difference between bare tablet vs encased. UAG also has issue with lower part- they've made lower side too light only suspended by one rubber strap, so it isn't perfectly sticking to edge of the tablet while kickstand is erected... I can deal with that, same as I could deal with issue you mentioned.
I'll keep an eye out for one that can be shipped to Poland or wait for them to appear here. Sadly Microsoft doesn't have store in Poland and Surface Pro tablets aren't common on market (probably due to high pricetag), so accessories are hard to come by at times- only things that are in real abundance are Incipio cases and sleeves.