Welcome to the forum
the issue does not seem to be a big one here and your right; no magic pill is going to work. So the India Jones quest for ostra should come to a halt. If you are working out for 9 hours a week and adding cardio/HIIT to your routine, then the solution to your problem is pretty clear.
1- your age is obviously making it harder to lose the wgt, older we get the more challenging it becomes- not impossible, just challenging
2- your diet needs to be changed. if you are going up and down 2-5 lbs something isn't right
3- your routine needs to be adjusted. HIIT with Tempo training and reduced carb intake or back loading would shock your system.
rather than any of us telling you to take x.y,z to assist, what is your diet and routine like now? What are your 8-12 week realistic goals? Are you limited to a certain time frame everyday that you can workout?
Everyone here will gladly help as much as we can