Switch to flower after plain water?

Don't let them dry out too often, this can cause further delays as your plant slows its metabolism to cope with the reduced water availability. Switching to flower and waiting until they have recovered and are making good growth again was a wise decision and switching now is ok. Try resuming feeding at half strength as it is better to feed slightly under, which is easy to correct, rather than trying to rescue an over fed and damaged plant, which you are well and truly aware of. After switching to 12/12, your plants will still need the extra nitrogen that is in the "grow" nutrients for a while and I would suggest waiting until the first "tufts" of white hairs/budlets are forming before changing to "bloom" nutrients. I usually go from grow nutrients to half grow nutrients and half bloom nutrients before changing again to just bloom nutrients. Hope this helps,.... Organoman.