Gozah, the main methods to gain are same in both routines: jelqing and stretching. The main difference is, that Linear routine is more flexible and so it is mentioned to be more suitable to your current situation and PE history.
However suitable routine for current situation is often key element for success. As for a newbie who has never jelqed or stretched before I would absolutely recommend switching to Linear routine. Your case is more complex.
I recommend, that you should start using guidelines and main principles in Linear routine, but should you decrease your routine or start it all over is a different thing.
Well, actually I think, that you should decrease your routine down to about 100- 150 jelqs, but it is just estimation, the suitable number of jelqs can be more or less.
You can also keep for example 1- 2 week off and then start the Linear routine from the beginning, but the start (seeing gains) will be slower, because you have done harder routine before.
Can you have a good erection after your current exercise? If not, then it is sign, that it is too hard, but probably the judging your current routine is not that easy.
If you have further questions, please feel free to ask.