Hi.
Looks great man! What size light?
I ran piles of the same HK years back & Sensi's "50 day flower" (or whatever) estimation was shite back then too.
If I recall, 70ish was more the mean average flower time. That 100 day you got going there is nuts!
If i was you at this point, I'd drop the ec to .5 (350ppm) or so, zero nitrogen, and after a week of that I'd go to pure water flush for 10-14 days, then cut.
I'm thinking that after Ravi took over for Ben, maybe something went wonky in their breeding area & god knows what happened, because HK classically has a more indica profile but these seeds you've got show heavy sativa influence & obviously the finish time is fucking tropical! Or, the seeds got mislabeled. There's always that possibility. I've not been happy with Sensi for years, I think they lost some/all of the P1 stock they got when they bought The Seed Bank from Neville in the late 80s, in which case their baseline P1 stock may consist of selections from seed that they tried to replace original P1 parents with, resulting in lots of results from their seeds that don't make any fucking sense.