running an AI for an extended period of time can contribute to bone loss... and there's really no reason to use it if you don't have elevated E2
SERMs, at standard doses for 3+ months (20mg daily for nolva, or 50 for clomid, or 60 for raloxifene and toremifene) has been shown to contribute to bone density demineralization in some cases
I would personally take a month or two off from estrogen-regulating drugs, drink your milk, get your sun (vitamin D) if want, can add in vitamin K for increased mineral absorption and give your body a little time to process/recover from the drugs you've already taken
Later can try a nolva/ralox run, or ralox solo... I haven't seen anyone stacking both, and I personally never tried, so I can't tell you how effective it is, and I assume as with all things effects would be on an individual basis.. I would just run ralox at 60mg daily for 2-3 months at the end and see if you get any improvement, it's the best SERM at blocking receptors in breast tissue... but since the gyno is set-in and fairly old, you may only see partial reduction... won't know till you try
best of luck brother, if want here's moar helpful info;
http://anabolicminds.com/forum/steroids/238309-using-drugs-treat.html
edit- correction, I had a friend who stacked ralox at 100 and nolva at 20mg daily, claims it worked wonders.... at reversing fresh, aas-caused gyno flares. Have no clue how effective against pubertal gyno
If you wanted to implement an AI, something low-dosed like aromasin at 6.25mg eod or something would be plenty, maybe even Erase or other forms of arimistane... SERMs raise test levels, which can contribute to extra aromatization, and slightly elevate E2, but you shouldn't need anything drastic like letro to regulate that, any mild AI should work... something like 6-oxo at 3-600mg daily would also work