LMAO.
My only guess is that you just have too much est floating around or other factors comnig from the stack that is just causing you adrenal fatigue (whens the last time you took a break from stims and took some reset AD for that fact?) or just over suturating the AR's with only smaller amounts of each compound (given your TAKING at least 4 and some are converting to more, like DHT and whatever other possible metabolites are made with the other compounds)
I would think the furaz would superceed all these for the AR though since its a pure androgen and likely has a stronger binding affinity for the AR.
Another question... whats your carb intake like? Its likely your not getting enough again and your getting a little hypo. Not enough glycogen=zero strength. Try to force down some solid complx carbs even if your appitite aint there.
I would still back down or off the test 50 for now regardless since you have test in there now too. Furaz will compliment all these nicely though and probably boost your strength back up too... got any lying around