That's genuinely encouraging progress, particularly bouncing back after the regain following your procedure. Plenty of people would've given up mentally once they climbed back past 300. Sticking with it and getting down to 275 is a real accomplishment.
Interesting point about the delay too. Seems like a lot of people describe that same 'nothing for weeks, then a steady drop' pattern once enough of the third compound builds up in their system. And honestly, part of what's remarkable is just how forgiving it lets your eating be next to what older methods demanded. Protein, hydration, and electrolytes all sound dialed in on your end, which is probably helping keep lean mass intact as the pounds keep falling.