Asthma question about my peak flow meter-help please!

ok, first thing that i should say (because this is relevant to my question) is that i am 18 and i swim A LOT.  because of my swimming, my peak flow is at 125% of the average (again, this is relevant).

ok, my question is: does the normal 'red' zone that my doctor gave me still apply to me, even with my high lung capacity.  i am wondering if i could actually be in danger before i get into that 'red' zone.  i ask this because, percentage wise, my peak flow would have to drop much more than the average person's peak flow in order for me to be in the red zone (50% vs 38%). if my peak flow, percentage wise, dropped more than other people's peak flows, wouldn't i have more lung inflamation (inflammation) and be more likely to have a lung collapse, even if my peak flow was still higher than theirs?

sorry if that sounded kinda nerdy, but i really am worried about it, since my peak flow has dropped up to 30% after a practice.  i am worried that i could be in some danger if my asthma attack is bad enough to get me into the yellow zone ( which takes about a 30% peak flow drop).

please help!