How fast is a graduate?

We have a pair of Graduates at our club and between them they have won everything this year, normally by at least 2-3 mins ahead of the next boat.  Both have the new style sail plans and race of 1165.  Having calculated a new local PY using the pys website it has come back as being 1110.  As predicatable they are less than happy about this and claim that at the grad agm they all think the handicap is fair (funnily enough).

Does anyone else race against the new style grads and whats your experience of this?  If i can get more information i can start to build a case for either the data being wrong or (more likely) a change of handicap.

Thanks in advance.

Both boats are new to the club and so we have little information to go on, which is part of the problem.  The helm of one sailed a radial for a few months last year and although far from a bad helm wasn't really winning any races. 

As for the personal handicapping thats exactly what i'm trying to avoid, i know the second helm is good but i'm unsure how good exactly.  Hence why i'm after more information on whether other clubs are having similar problems with their grads or whether we've just got two good helms in well sorted boats.

One argument that comes back is how can a boat with less weight and slightly more canvass that an enterprise be 50 points slower?  I know that the hull length is around 1 1/2 feet shorter and maybe this is the 50 points? Alternatively adding a fat head sail and more sail area must surely make a boat quicker than the 2 point (7 sec/hour) change that was made to the handicap last year?  Maybe not i don't know, hence the question...anyone got any ideas?

I get the impression that although there are many grads that may race, most are a single grad at a club (i know of two other clubs where this is the case) and so its impossible to do a handicap adjustment thats not a personal handicap.  And as has been discussed in other threads i'm not out to handicap the sailor just to ensure that the handicap is as fair a representation of the boat as possible.

See 1140 is something i could very well believe to be a more realistic number for the conditions, also it may be easier to convice all parties if another club is using this number.  Are other Grad clubs using alternative numbers or is this a one off?