As Xman has mentioned crankcase can get a bit of pressurisation if something is wrong with crankcase ventilation be it something blocked or a faulty PCV. With excessive crankcase pressurisation gases will try to escape somewhere, be it inlet/exhaust valve oil seals which can increase oil consumption and this may show up at the exhaust tailpipe [EDIT - the oil in the inlet manifold might be a clue?] . Re check everything re crankcase ventilation. Different engine but my old Octavia 1.416v suffered with a blocked oil pipe within the air filter housing as part of the breather setup that caused the oil level to be low after a few hundred miles, when I sorted it oil consumption went back to normal.
Also how many miles has the engine done? Gases being blown out could also be a bit of piston blow by? When working with older cars in the past I've known crankcase pressurisation to push oil past all sorts of things be it oil valve seals , crank oil seals, gaskets (sump, rocker etc) and on an old Cortina the dipstick was ejected.
Cylinder no 1 misfiring is strange - just in case is all well with the timing chain, no rattles etc?