Don't worry about the flies, you do need to put more green garden waste in but don't put too much grass in at a time, its fine if you mix the grass in but dont just plonk a lump it on top as the heap won't be able to breath. Put as much vegetable matter in as you want, just ensure that its got adequate ventilation and doesnt become too wet. Tree clippings or straw is a good addition.
I put very little if any cardboard/paper in mine and have never heard of 50/50 ratio, more like 90/10 I 'd say.
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