I do not consider myself an expert, so I stand ready to be corrected, but I think if there is no step-down fix specified, you can descend at any angle to your MDA. The heights and distances are simply an illustration of a notional glidepath.
For flying the hold, you are correct that you adjust the outbound leg for wind, so you can achieve a 4 minute hold. That is why it specifies "still air" times. Obviously, if there is no wind, there is no adjustment to make.