Hey man,
For such question you could use Ask what ever you want thread.
I’m too lazy to check your routine and how long are you on it.
If you don’t see any gains after two months i would rather suggest focus on technique of exercises you are making.
Minutes does not refer to quantity or quality of manuals.
Focus that one stroke should last 3 seconds at least.
Make it slow with medium tension.
But if you want still to try go on it for few days. See what you will feel or your how your penis will react.
I’m sorry forgot the link:
Ask what ever you want (p. 33)