Adex 2 weeks on 2 weeks off should be fine
You don't need to stay on them all the time. Tamoxifen blocks the receptors so the estrogens are still going to be there- when you go off them you get that massive influx of estrogens. Adex will stop estrogen from being produced, so it takes a while for levels to build up again
There are loads of ways to skin this cat but ultimately you need regular blood tests and trial and error to see what works for you. It's a fag, I know but these are hormones pay attention to your shit