Check out my post on multi-vits, you may not have been using one that's as holier than thou as you may think
By the way, amazing weight loss totals and not too rapid either
. An acceptable rate for someone with your previous weight. The average of 5lbs, should hopefully taper off a bit, so you don't end up becoming a rapid loser, with loose skin lefotver and one or two issues.
As for you wishing to enter strongman competitions, I'm sure you'll be able to manage that without too many issues