My advice would be to spice things up. 15 minutes of stretching is hardly anything. When I started to see growth, I was stretching whenever possible, for as long as I could. Yes, EQ will be affected from overwork, but for me the gains outweighed the EQ.
I also found that doing expansive work alongside elongation exercises did wonders. You can pump, and then stretch directly after. Slowly condition yourself for more advanced stuff, and then spike the intensity to “shock” your unit.
Don’t fall into routine. Keep your member guessing. Be dedicated, consistent, and most importantly BE SAFE.
Blessings.