Whatever you do DO NOT stack any combination of T3, clen or ECA together. And based on your level of experience ignore the advice of anyone who would suggest that you stack them together. If you do decide to use any of them use them SOLO and learn the proper way to cycle them at your own risk.
Just on the fact that you had DNP in your procession I will go out on a limb and tell you to throw the rest of those in the trash as well.... because as of right now they are the devil in the closet calling your name and you have no idea how to use them.
Experience and enjoy the benefits of a properly tailored nutrition plan and kick the chemicals to the curb for now.
BTW- There is no such thing as STUBBORN FAT. That is a marketing scheme to sell the latest and greatest device and/or supplement. We cannot spot reduce fat. We can only reduce our overall BF%. It just happens that your lower back fat is the last to go and you have not done enough to make that happen yet. It took you years to put it on so express the same patience in removing it.
No short cuts and no excuses!
SEMPER FI