FWIW, you might want to give consideration to your training schedule as well (if you aren't already). IMO one problem w/ running big cycles is that w/ the strength gain, your other soft tissue structures (joints, ligaments, tendons) don't always get the same support and start to degrade (tendonitis, etc.) Cycles can promote growth of tendons and such, but I also think the recoverability (anti-inflammatory, etc.) of cycle can hide greater issues that you would't necessarily realize the extent of until you came off and the anti-inflammatory / recovery aspect is no longer present. I'd definitely pay attention to your estro levels - esp w/ the AIs, tends to be my first focus if you're experiencing joint pain. Deca will definitely help "lube" that area - but if there's already damage, it can get exacerbated if you don't also reduce the daily stress on it. Compromised soft tissue structure, over time, just degrades and goes to absolute shit when you hit your mid-40s.
For what it's worth, I experienced patellar tendonitis around 2004. I was able to deal w/ it w/ some physical therapy, but since then I've had tweaky knees that I'm only just now being able to start managing - I've been off the competition circuit for about 5 yrs due to a rotator injury (more soft tissue stuff!), age & professionally speaking, I've moved around quite a bit lately w/ my work - I ended up backing way, way off of training but still continuously ran into problems w/ my knees not hurting when doing any leg training w/o extensive warm up - I've started working w/ a trainer who is literally starting me from scratch w/ mobility / flexibility and targeted strengthening, primarily for my shoulder, but also for my whole body given the time I've been really out of the gym (conditioning) - I'm just now starting to work up to training like I used to after about 2 months of really light PT -type stuff and a lot of ART (none of it actually specific to my knees) and I've been able to go completely w/o using knee sleeves (my crutch for the last 5 yrs). It has been a lot more to do w/ building up the push/pull balance of my quad / ham so that the knee can work correctly. But the damage was done 10+ years ago where it is taking me this long to get things structurally sound again. The soft tissue was probably damaged and probably repaired since then, but the overall imbalances I've developed while trying to work around the original issue is the resulting cost that I need to repair now.
Anyway, sort of obvious, but I wanted to throw that out there. I see so many people looking first at the drugs they can use to "fix" something when they really need to also give consideration to the repetitive motion that is the source of most of the injuries in weight training. Yes, definitely look at your estro levels as well, but w/ or w/o the drugs, your body still has a breaking point of the soft tissue structures that underly everything else.
Good luck - and train accordingly
