That is the glucocorticosteroid effect of steroids which is basically not illegal. Only the steroids with anabolic effects that is banned. Athletes have used steroids for ages to make injuries heal faster, or avoid inflammation. Those are not illegal as those drugs do not have anabolic effects.
Steroids use is a balance between getting the most benefit without being caught. Some steroid have massive anabolic effect but minimal andronization (which is basically a giveaway - see 1980 olympian Ben Johnson, Mark McGuire, Sammy Sosa physical looks). Modern Steroids have varying degree of anabolic effect and athletes use them to their advantage while trying not to be detected. You might not get the maximum anabolic effect but it also has least chance of raising suspicion. Losing fat helps but most athletes would probably have between 3-4 per cent body fat with proper training anyway. There are several anabolic steroids and they differ in their potency. But if you take the one which causes so much muscle gain, you are just attracting attention to yourself. Assuming that the stoird you are taking has minimal anabolic effect, then what is the point if you can actually achieve that one with proper training anyway? Strength training and conditioning, plus diet (protein) would give you that anyway. Basically, gaining strength by using anabolic steroids is a wrong way to go in boxing. What you are gaining are not fast twitch muscle strength but brute strength. If you plan to be a bulldozer in the ring, it might work.
Again, you're partially right, but wrong in your basis. Sure, if you suddenly gain 20-30 lbs of lean mass then it's going to be an obvious giveaway. But you're showing a lack of knowledge of the indexes by which steroids are rated. There's an Anabolic index, and Androgenic index and a Therapeutic index. The last is derived by diving the first two. testosterone which has an Anabolic of 100 and an Androgenic of 100 has a Therapeutic index of 1, Winstrol, which isn't especially Androgenic but is highly Anabolic has a Theraputic index of 20. Oral Stanzolol, or Winstrol was the steroid Ben Johnson tested positive for, though according to his trainer it wasn't the only steroid he was using as it's a Class II steroid, which he was stacking with a Class I. You're getting yourself highly mixed up with anabolic indexes and androgenic ones. Anavar which is a hugely Anabolic steroid (used for burn healing, HIV patients, following trauma etc), which will give nice, lean steady effects (strength, muscle hardness, increase in red blood cell production, stamina), without massive water weight gain or androgenic sides. To state because it's not giving enormous muscle weight gain it's pretty worthless is silly. It'd be taken now if it wasn't so easily detected and was done in the 1960's and 70's. To say that most athletes have their bodyfat down to such low levels is again, silly. Many shot-putters don't, superheavyweight Olympic Lifters don't and a lot of boxers don't to name a few. I seem to recall a study on marathon runners, showing their bodyfat percentage was a lot higher than most would think, due to the nature of their event and training being so catabolic their muscle was burned away so their percentages of bodyfat were higher than say, a sprinter. You're also being a bit nutso in your statements again and contradicting yourself. You say that you're not gaining fast twitch ( or type 2) muscle fibres and earlier use Ben Johnson as an example. Kinda weird since sprinting uses fast twitch muscle fibres.
PEDS can increase stamina and increased stamina = better chin. No doubt about it. When your body and lungs is fresh and flowing, your head is clear, your sight acute and your recovery time faster. So yes, PEDS can improve your punch resistance.
you can get stronger without gaining weight. Ask Armani who posts here who's 130 pounds and benching 255