Hi
I was in a similar position to you being 6'2" and 17 stone ie. Right on the limits for the R22 as per the POH.
Prior to my latest bought of training and JAR Class 1 I went on the caveman diet for six weeks. I dropped a stone and a half, my blood pressure went down to 130/65 from 140/85 and my cholestrol is now 4.3.
Weigh up the health benefits as well of the cost implications of loosing a few stone. Over a 45 hour PPL course you will save about £6k by shifting a bit of excess weight. It's a no brainer !!!
Cheers
ET