Topping autos is not advised due to the recovery time taking too much time out of the vegetative growth stage, resulting in the plant flowering with minimal growth time.
Low stress training, like tying the branches down and the main stem too, will boost yields without slowing over all growth.
I would also advise against defoliation, this just reduces the plants capacity to produce energy, thereby slowing growth.
Comparing your grow to other peoples is never helpful, there are too many variables involved with growing, that direct comparisons are not valid.
Things like an individual plants genetics/phenotype, light intensity, temps, nutrition, growing techniques, grower experience and general plant health will all affect each and every plants growth rates and yields, making comparisons pointless.
Like everything in life, there will always be someone doing things better, just like there will also be others not doing as well either.
Hope this helps,..........
Organoman.
P.S. - It is also unwise to try and guess yields, weeks from harvest. Something about counting chickens I believe.
If you are interested in yields to be proud of, forget autos and grow real plants - photoperiod fems!