Expect them to grow about another 12-14" or so. They will stop growing around week 5. Lighten up a bit on the "Grow" part of the G/M/B and it'll give the plants less N to grow so tall. Easier to just veg less time next time and problem solved!
For the nutrient burn, remember that correcting it by lowering the ppm doesnt make the burn marks go away. The leaves wont just suddenly re-turn green. The NEW growth, however, is what you monitor to ensure the ppm is better.

New growth = green = great! Old oopsie growth = too bad suck it up = will look a little better but not perfect.
Without Co2 your lookin at 9 weeks, with Co2 8 weeks for LSD
Kitty