I've been playing around with all kinds of cycles for the last year or more with this issue and cannot seem to sustain a strong drive. Out of the blue I'll get it through the roof and times where its literally gone.
2 things...
1: you are 40... having your old 25yr old sex drive back may be impossible.
2: give yourself a solid break from AAS and let your body recover.... maybe just run 6-9 months of just TRT.
Throwing random drug combos at it isn't the answer IMO