Try tying it down a bit each day till it's slightly arched (don't go extreme and snap it). Gradually bind it with ropes little by little. Thats the best you can do. Seriously though a 3 foot tall plant will end up being 6-7 feet tall by the end of fruiting (or more if you have crazy stretching)...
3-4 depending on size. If you're going to have 3-4 mother plants you might as well grow 3-4 different strains. It will take 2-4 weeks for the mom to recover from the trimming.
Most shipping companies just x-ray a random sample, I'm sure it's statistical based. It would be way too costly and time consuming to sample every package. Anyone that's worked for UPS or Fedex can tell you how crazy shit moves in their hubs. They want you to fill up several semi's worth of...
You should be fine if you're fruiting small cloned plants like an SOG type grow op where the plants will be 1-1.5 feet tall at finish. If you want you can move them into larger pots, I'd do this if you were growing in soil. If it a hydro grow in a flood and drain table setup then you shouldn't...
It depends on the breeder but generally fems produce more hermies then normal seeds. For a good pack of fems you should plan on having 80-90% females and 10-20% males/hermies. Really bad breeders will produce extremely mixed results (anywhere from 50-50 fem to hermi ratios or much worse with...
Spend your money else where. Magnums are built like shit. I had one come ripped up from the factory. And my other 2 (one a replacement for the ripped one) both can't have the side frames screw back into place. Once you unscrew the unit to screw in a bulb the unit's shape shifts and nothing fits...