you could just do a flor/hps combo. for max bud weight theyd be dense. my next mass cropping is going to be with that setup. tried once, worked out well.
could be a calcium def. could be over-nute-ing, also check for heat stress. it's fine to water every day, sparingly, and cut out the nutes to be safe. get the soil flushed. let us know as much as possible.
get the temp down 5º. replace one of the MH with a HPS for flowering. as for what strain, you wont be able to tell. and only the best of the best would be able to tell you, with a high chance of being wrong still.
benefits are b-vits and carbs mainly. its worthwhile for organic grows. the amount differs per strain. find out what your plant likes. but as a general rule i wouldnt start out with more than a leveled teaspoon
yeah youre looking at about 4-1/2 month until you can smoke. drying and curing will take another month. but you probably wont cure so you can cut a month off that
this may be a stupid Q fdd, but have you tried lady bugs and neem oil? ive only had to use that combo once, and it worked perfectly. outside of that, i dont know what to tell you