As you have said you don't meet the inital CAA class 1 requirements, however the CAA themselves state that if you don't meet the intial limits but fall into the renewal limits then speak to them and they will look at each case on a individual basis. Give them a call, they've always been very friendly with me (if not always giving me the news I wanted to hear!) but they will be able to set you straight on exactly whats cricket.
As your instructor says try and get your medical sorted ASAP as it is the one thing that you can't change if you can pass or not. Good luck!