Innovation is not disloyal, in fact, that is exactly what any real teacher would have built us for, training effectively, recognizing excellence, defining the key points, and processing new information in terms of what is relevant, and of what we already know that works...
The thing of it is, when it comes to the Hung Ga Kyun, for most people, anything more than Gung Ji Fuk Fu Kyun is just too much, twice a week, 90 minute sessions each...
For somebody who likes to get up early every morning, the Tit Sin Kyun is possible, and likely will amount to something great...
If somebody has time to put together a set of longhands for themselves, gaining more versatility with their shorthand skills as well, Fu Hok and the Sap Ying offer a convenient gradient for that, and several dozen extra skills on top of what should already have been assimilated from the Gung Ji Fu Fu Kyun, after some 3 years time. This not only will require extra practice sessions, but with an auxilliary program of development, with training equiptment, coordinated among workout partners as well...
So, at this juncture, if your results don't justify your efforts, you might consider running back the tape, to see just where you might be going wrong, as you should already have all of the main, important points of Southern Chinese systems blended within that format, and thus be an example of "what those do"...
What else could you possibly want to practice?
Best,
Michael