Good decision, because DP genetics does not contribute anything to this sick "late flowering". It was most probably not late flowering but alkaline lockout as in my case. I have done over 50 TDs with Hesi before using AN. The latest one was cut at day 72 with 145g dry, but some of them were cut at day 60 with 100g dry. And it was not early cut, they had been finished. During all that time I had been reading about 100+ phenos but I had never seen one.
Three months ago I started to use AN nutrients and suddenly I had discovered late phenos. Unfortunatelly they were not late phenos but lost phenos.
Might be that your well water changed after winter had gone and it is more hard and alcaline now as it was before, because your plant from the end of January is just divine (that one on DP contest). That might had thrown AN PH perfect out of balance. I just guess, but I suggest you to discover what was going on, because you might lose some more plants. After my grow that you are familiar with, I had thrown out 5 more plants for the same reason and switch to Hesi.
Good Luck!