Its not a difficult decision to make. I'm not sure why people worry about this, I've seen many similar threads. If your predicted grades are close to the requirements, then apply. The further they are from the requirements, the bigger the risk is. It will always be a risk if you don't meet the requirements. It may also be a risk if you don't meet the requirements with ease as competition for places is high.
As a result of these two facts, it comes to a fairly simple and logical decision to make, if your taking a risk with your firm, make sure you'll definitely get into your insurance with ease.
I don't know what answers you or others have been looking for. We don't know the requirements for your course. We don't know how competitive your course is. We don't know how flexible the department will be.