Seemingly bad RNG with map drops

I didnt found a carto box yet, but I have tons of maps 66-70 for pure MF-ing and some 70-75 aswell for leveling. Currently one bar away from 81 lvl.
p.s. : I dont use Zana.

For cartographer boxes: don't skimp. I regularly chuck 10-20 chaos at a box looking for +items and +chest level (at least 74+), because getting a single 78 map out of the box will instantly repay anything I just chucked at the box. For each extra you get, that's like 4-5 75's.

Besides that, running nothing but blue maps isn't quite as viable as it was during the heyday of ambush. At least put some quantity on your maps.

Even chiseling and using an alchemy orb is producing the same results for me. I've had lvl 70-71 maps at upwards of 111% item quantity, and the net result, on average, is at most 1 map of the same level or higher. Eventually I'm back to level 69 maps

RNG ... there is no math behind it .. That's the truth no math behind the RNG = luck ..
In real life rng is called luck ..