So, what I have managed to source out thus far ... Decanoate is one of your longer lasting esters. Esters consist out of mainly carbon and hydrogen (C and H) atoms and they primarily bind to the hormones mostly at the 17th C-position. The main function of esters is to prolong the release of the actual hormone from the site of injection ... right so far? This leads me to understand that Test Suspension is a very potent drug, but it needs to be administered daily, twice a day if you can stomach it, and the composotion is of such a nature that it doesn't really have an ester attached to it, whereas with a cypionate or decanoate ester you have half lives of anything between 3.5 - 9 days ... leading to, in theory, 1 pin/week being effective, whereas Enanthate is a lot quicker to respond and requires more frequent pinsto keep blood levels up.
Now this all leads me to believe that you can stack Test Deca and Nandrolone Deca together, even mix them into a single pin and pin once a week with reasonably good results?
Now, Esterification temporarily deactivates the steroid molecule. With a blockingof the chain at the 17th beta position, binding to the androgen receptor is impossible (no activity can be exerted on the body). In order for the compound to become active the ester must be removed first . This occurs by default once the compound has filtered into the bloodstream, where esterase enzymes quickly remove the ester chain from the steroid. This will restore the necessary 17th beta position group, enabling the drug to attach to the receptor. It is only now will the actual steroid be able to have an effect on skeletal muscle tissue. This indicates to me that considering testosterone cypionate more potent than enanthate makes little or no sense, as the muscles are only seeing free testosterone no matter which type of ester was used to deploy it.
That sorts out esters for me, fast releasing one (which tend to hurt more, as my first experince with Sust 325 tought me yesterday, and today, the whole day!! LOL!!!!) and slower releasing ones, like the Decanoate and Cypionate, which hurt less when pinning.
Now I am still looking to find the difference between Test and Nadrolone ... hmmm ... time to go researching again!
You get Nadrolona Phenylpropionate, which is a shorter acting ester attached to the Nadrolone, as oppose to the Decanoate, which is a longer acting ester, but, essentially, it is still the Nandrolone which makes the anabolic and androgenic difference in your body's hormonal composition. So, what the hell is the difference between Nandrolone and testosterone?
I have also read that the 5a -reductase process, during which the enzyme which converts testosterone to the more-potent DHT, actually converts nandrolone to a less-potent compound, and that Nandrolone, irrespective of it's attached ester, will convert to estrogen easier than Testosterone, making it a higher gyno risk drug to use. AI's are, as per some sources, not proven to completely elliminate this side-effect, but proven to reduce it significantly.
Now, with all this said, I FREAKIN' STILL DON'T KNOW WHAT THE ACTUAL HORMONAL DIFFERENCE IS BETWEEN NANDROLONE AND TESTOSTERONE!!!!!! Aaaaaaaarggghhhh! I know the difference between Testosterone and Estrogen, and what their respective roles in the human body is, and I know now that Nanrolone is only ever naturally present in the human body in small quantities and for short time frames, but COME ON ... what the hell is Nandrolone? "sigh" ... suppose I'll discover info on it some day ... or as soon as Radar calrifies it for me 
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