I agree about the adolescent phase.......they can be real little s**t's at that stage. Try to mate with everything, wing dancing the big boys (STUPID!) and even coming over to wing dance me.....I just let them get close and pin them down with my hand a few times.....it is usually enough to establish who is the boss.
My cockerels are still 'testosterone troubled' in the morning (well, afternoon and evening, too, if I come to think about it) at this time of year, but the older boys are going into their Winter Slumbers and won't be very active until the sap rises again in the Spring.
Kadjain Any aggression towards you is testosterone fuelled, too, but you MUST nip that in the bud.Sounds as though you have already done that, but you may need to reinforce it. If a few 'pinnings down' don't work with mine I carry them around under my arm in front of the flock for a 10 minutes or so on two consecutive days. That has never been known to fail with my crew. Your roo is trying to show his dominance and does not like you bringing 'competition' into 'his' yard. You will have to make it clear it is YOUR yard and you will bring in just whoever you like.
Oh heavens.....male goats...We had a male pygmy goat some years back (short, stocky, huge horns) and he was a nightmare at this time of year. I ended up being unable to walk for 6 months due to HIS aggression. I'm sick of being head butted by a ram right now (who has a permanent footprint on his head), but my 4 other rams, one of which is massive, are either sweeties or very reasonable. So the testosterone acts on what is the underlying personality. This goes for roos. too.