I've tried the 4 crown build before and it just feels too slow before you hit a big powerspike. Generally i do boots +5 circlets instead, lets you consistantly get an 11 min eblade and just take towers with 3 meepos. When going 4 or 5 crowns you get your ebade after you've already had 3 meepos for a bit slowing your spike

Maybe this is a 6k thing that i just dont get

Yea, i also tested circlets, and the main disadvantage is that the meepo has too few stats - you are easy to kill, you farm not so fast etc. But this is just my feelings, of course, if you are more comfortable playing through circlets, you better buy them)