Someone else PM’d me for a length routine earlier; they also had good girth, but were struggling for length. I rarely do routines for individuals, but I did in this case. This is what I suggested; it may work well for you also. (Reply slightly modified to not identify original recipient).
First of all, you need to stick to a consistent routine. As you have ‘X’ months of PE, I suggest 2 on 1 off, 3 on 1 off, to make a 7 day week.
You have good girth, so heating is important. Get some hot/cold gel packs from your local drugstore (chemist) and use them over a damp tea towel or similar (t shirt material etc.). Get your penis well warmed through before you start, and keep warming it during your routine by putting the gel pack back on when you cool off too much.
Use toilet paper for a good grip. Stretch to what you feel is as long as you can make your penis, (don’t use more strength than is needed to get max length, but use enough to make sure you cannot get any more length), then mentally try to relax into the stretch. When the feeling of stretch becomes less, increase the stretch slightly until you feel you are at max possible length again. Concentrate on your breathing, and really try to feel your penis relaxing into the stretch on each out breath.
Spend 50%-60% of your time on straight down stretching, and spread the rest between the other angles (Imagining a compass, I work S {straight down}, N, E, W, SE, SW, NE, NW + straight out).
I can’t tell you how long to stretch for: you are finished when you don’t feel you can get any further feeling of stretch - when you feel your penis has reached a ‘dead stop’ with all the angles. Usually takes between 10 and 20 minutes.
When you have worked all the angles, make sure you are warm and do your jelqs. Do 50.
After you have done your 50 jelqs, do another 5 minutes stretching just doing straight down and either side of that (SE and SW).
Then do another 50 jelqs. You don’t need girth, so the jelqs are just to help stimulate elasticity in the tissues and get fresh, oxygenated blood deep into the tissues you have worked.
You don’t absolutely need to warm down after, but try to do light fowfers when you can on work-out days.
Keep to that for 2 weeks, then every week or 2, if your PI’s are OK, add a little extra stretch time and a few more jelqs.
Keep accurate BP measurements, and check them once a month.
When gains slow or stop, reduce your routine by one third for 2 weeks, then take a three week deconditioning break. Start again from the beginning.
Try it and see if it feels right for you. And please report back. :)