Herbs or pharma... Either way you would most likely have to lose virility to grow.
You may or may not lose function. Or you may even learn a whole new way to enjoy entirely new sexual sensations.
So my first suggestion before we go any further is to either girl up and face the consequences or forget about it.
Store some sperm or don't, but you're going to have to face the very real probability that you will lose your ability to produce viable sperm to go forward any.
Then... Once you're truly ready to face that very real possibility, I would suggest dropping the RC and flax, and use ONLY PM. Continuing to use the topical is fine, but I would add an internal intake as well.
Fenugreek is ok as well. And I would probably add at least spearmint since you do appear to be more resistant. Possibly chinese skullcap as well. The latter two are for anti-androgen. You're probably going to need it. And it will probably, eventually, cause you to stop producing sperm entirely.