Over-ferted, can I go back into veg?

Using: Coir/perlite/castings/mycorrhizae mixture
Added: 1/2 cup guano powder per 3 gallon pot
Watered with: 3/4 strength Pure Blend, Liquid Karma, Liq. Kelp, Thrive Alive Red, every 3rd watering through 1st week flowering


Major problems: the plants got burned (too high soil fert level) by the end of the veg period. Gave them a thorough flushing (I flushed until the runoff-water-reading came down from [off of the meter; over 2000ppm] to about 1000ppm (using the x0.7 conversion). At the first week of 12/12.
I thought they'd recover in a couple weeks. But 3 weeks later, they're hardly any bigger, growing super-slow, and no smell at all (at 3 weeks into 12/12). They aren't going to be worth finishing like this. Finished some like this once before -- the result was tiny yield, quality so low it was almost not smokeable (almost-normal-looking buds, but with no resin on them, hardly any smell).
My question: can they be put back into veg -- to get healthy again for a month or so before starting to flower (again)? Has anybody done this?
If they went back into veg now, say for 4 weeks (2 weeks to start vegging again and 2 weeks of veg time), would they still flower normally? Also I figured they'd have a really developed root system by then, good for flowering. And they're fairly big, would have good leaf area for vegging.
Is this a recipe for disaster, malformed buds that won't grow/set properly?

Any help welcome

P.S. Was flushing down to 1000ppm (x 0.7 conversion) at start of flowering still too high for soil/organics?

I know growers who use wormcastings & guano ,they can go from start to finnish without adding a drop of additional fertilizers,giving half of what you fed them(every 3rd wattering?) every two weeks would've been more than adequate,you flushed ,and still no improvements,is there any foilage left or any new growth at all ?,If they seem to be getting drier with no signs life,they probably can't be salvaged,try flushing again to about 600ppm,then wait and see if it responds,there is no quick remedy at all for your situation,only time will tell,give them only continous fluorecent lighting for now(about 160WTs),i wish i could help you out more,good luck....bonbon

I planted in containers that were too small, so I went back to vegging
after a few weeks of flowering. Plants responded well! I repotted to
allow for more root growth, as this seemed to be the limiting factor, and
plants grew nicely.
Returning to vegging may help rid overabundance of ferts (esp. nitrogen);
a little extra time under 18/6 can do nothing but good. An extra 6 weeks
vegging can turn a setback into a winning situation. Good luck!