Glad i could help.
6-oxo is an OTC suicide aromatase inhibitor (similiar to the perscription drug aromasin) ... it permanetly binds to the aromatase enzyme and does not have a half-life (as opposed to arimidex which binds to aromatase but not permanetly). I asked a few questions in regards to how the body responds to this over at the avant forums (I STRONGLY suggest you join their forums as Par and Dante and others are much more educated in this area and many others.) do a search with my username and "6-oxo" and you should find the thread i'm talking about... lots of good info.
As to your other questions, I will take a stab, but once again the avant forums would be a better place to ask (there are also some very knowledgable people on this board and I do not mean for my suggestion to be taken the wrong way... its just that the avant forum already has such topics in discussion and is usually more active in endocrinology/andrology/biochemistry discussion than this forum is.)
(once again, the below is my best guess)
1. For me (and this will be individual and dose dependent of course), the boost in test was evident very quickly (libido, etc..) but I can't say as to whether or not this boost (which is relatively small.. as our natural test production is nothing near the common androgen/PH cycle amounts....) will have a noticable effect on body composition (muscle retension as you said).. I would speculate that it if you are older and the increase in test was substantial then the aid might be minorly noticable.... A better idea would be to use an ECA to help retain muscle (as well as aid fat loss) Here is a wonderful article on this by Bryan =
http://www.musclemonthly.com/article....ork.htm .
2. The "cutting effect" will be partially from estrogenic water loss, this will be regardless of a caloric deficit.... when it comes to estrogenic fat loss, a caloric deficit naturally be extremely beneficial, however, after talking to some people on the Avant forum and from a little personal experience, the fat can be mobilized even in at maintenance or hypermaintenance caloric intakes, but at a much lesser extent, and can even be deposited elsewhere on the body (non-estrogenic)... a more believable example of this is with gynecomastia treatment studies in which people were given nolvadex (i know its not a AA, but in a practicle sense, it elimates the effect of circulating estrogen on the breast ER).. depending on which study, a very high percentage of the people had decreased gyno noticably after a few months of use despite any kind of proper diet or planned caloric deficit. (of course, such a treatment has many negatives IMO....). Bottom line, yes it is going to more evident with a caloric deficiet which you should already be in if you are going to cut in the first place.
3. Personally, the fat did not come back any faster than other fat provided I did not get too reckless with my bulking diet... this will vary alot from person to person IMO, so once again, I can't really say with certainty... ask the avant forums
Another point to consider with rate of fat return is that if your estrogenic fat was occured due to a past estrogen spike (puberty, a period of awful diet or alcohol use) then the results will be more likely to last (provided you are using your head with your diet).. but if you have a current/on-going estrogen problem then they might not be as long lasting (all other variables constant of course).
