I reckon you should be alright. If your vision falls within the renewal limits they'll also look at your age to see whether you would be stable or whether your eyesight is likely to get worse and make an assessment on that. You are not far over the initial limit and given you are 28, your eyesight should be stable by now so I believe there is a chance you should be alright. You might have to provide your last couple of prescriptions to see whether that is the case.
Something similar happened to me at my initial class 1 (although not in relation to astigmatism, but in relation to short sightedness) and they gave it to me as I fell within the renewal limits and was about your age, so hopefully they will issue you with your class 2. If that's the case you will have a limitation saying you'll have to use spectacles, but lots of pilots have that and it would be nothing to worry about.
Good luck.
p.
