Completely agree.
On first hearing the pre shape, the initial response it to turn it off and use the flat shape and eq as it does sound a bit duller, but it really does work in the mix.
I always have to add more mids in anyway, but it really sits well and does that sound where it also kind of fills in all the gaps in the mix.
Definitely try a RM500 or 800 if you can.
As I've said before, ashdown are wonderful for getting the job done. You can tell theyve been designed and built with the aim of sitting in the mix well, rather than having a great stand alone sound that doesnt work in a mix at all.