No worries mate. Personally I don't think that having 4 or 8 plants will matter much in the eyes of the law for most of us. At the end of the day it's down to the cops discretion whether you will be done for possession or supplying.
If it "looks" like a plant factory, well that could go against you, agreed ... but by looking at my setup it is quite obvious that it is for personal use only.
Maybe a cop would be more intimidated with a few plants that are as tall as him, and laugh at my plants that maybe reach up to mid thigh. Who knows mate, depends on the cop, what area you live in ...lotsa different variables, how respectful you are, whether you've been in trouble before, whether they heard you were dealing or not and whether you've got a job or not.
Unfortunately I do not have a medical card, and no such thing exists in my part of the world. Maybe someday
As regards flowering clones, I have no experience whatsoever. I only grow from seed. I am one of "those" that believe that clones develop more lateral roots, whereas a seed will develop a healthy tap root. I believe a seed will always grow into a healthier plant than a clone, that is just my opinion.
The only time I have ever experienced stretching with 12/12 is when the temps have been cold (and ... the initial flowering stretch of course)
Peace ORBEH