I wasn't gonna say anything but I too have found that topping the third node (twice) to stop vertical growth of the mainstem permanently, will cause polyploidism. Especially in autos. Check out my journal and you'll see I done the same thing then my node 1 branches grew with random polys (multiple random sites with double budsites at the top)(which have split and grew out of poly) the other branch at node 2 grew with a set poly of 3x3. Single top with three branches at every node. This is what you want. 3x3 branches will yield the best. But anytime I top-stop at the third or lower node, I get polyploidism. 4th node presented one poly branch (random) which also grew two heads(as if I topped it). These were all autos. They seem to react differently than photos when topped early. Maybe something to do with genetics, Or it could be a coincidence. Idk, but topping early gives me poly tops.