Mtrot, if you were to simply google "Devore Gibbon 8", you would have possibly a day's worth of reading, including many reviews. They have been one of the most popular and well-reviewed speakers around for probably five years now.
OP, at 7', you are of course getting almost all direct energy (as opposed to reflections) and so toe-in should indeed make quite a difference.
If you find this new model to be that much different (worse) in that regard, you could ask Vandy to pad down that tweeter a bit (or do it yourself). It may be that your new speakers are indeed a bit hot, or it may be that you just like treble a bit subdued, or it may be that due to xover changes your amp is putting out more power in the treble region due to an impedance hump, or it may be several things.
But, it sounds like you are set on new speakers, which I can relate to. :)