Be sure the anchor is what you think it is. THere are a lot of poorly done copies out there, especially the Bruce but also the Deltas and I have seen a few questionable CQRs, not to forget about the Danforth. Those copies are mostly a waste of otherwise good metal. Maybe not all but far too many.
THe angles and shapes are wrong, the blades don't match, the metal is thinner, shanks twisted, maybe even the metal is questionable and so on.
The original designers put a lot of effort and thought into their designs ensuring consistency and that they worked. They may not be quite as good as the good/best of the new ones but they were still good anchors if chosen properly.
BUT ALMOST NONE OF THE COPIES are worth the chance. They fall way short of the anchor they copy.
I agree that a 35# anchor for a 40' boat sounds too small. I have a 5Kg [33#] for my 32' boat.
I suggest at least a 50# for your boat., maybe more as Hatteri were built heavily.
And of course as discussed, scope, tackle and bottom plays into it heavily. Not to forget windage, wave action and current.
JMO