I’m afraid too late now for your July trip but according to © Google Maps there is a route that is 64 km shorter (and about 20 minutes quicker) and another (E81 all the way) that though only 9 km shorter is a further 22 minutes quicker. There is also at least one other option that is both quicker and shorter:
Judging by a quick look with Pegman, the road surfaces are very good, though the E81 can carry more traffic than the E70/A2.
Credit:stackoverflow.com‘