It is very simple to achieve great rosin. With the proper pre-rosin, the technique can be so simple it is mind-blowing. This page goes into more detail than your Basic Rosin Tech method. There are many tips and tricks that will help you increase your rosin yield and quality. I will try to explain some of the science behind extracting rosin to further explain the tech. Below are all the different ways rosin can be extracted.
Hash/Sift With Screens and Hair Straightener
Hash/Sift With Screens using a Hydraulic or Pneumatic press