I would expect that this deep into summer the EPO and especially the PNA would have minimal, if any, influence on the pattern at all. the other thing I think to keep in mind too (and this fits in with your bolded) is with this pattern upcoming, it is likely to be quite convectively active across the International border with potential for numerous MCSs and squall lines. Given we're downstream of this, the impacts (or how the models think downstream will behave) are going to be more pronounced over our region.
I mean at some point we are going to start to see noticeable changes occur as we continue approaching the equinox, but we are a good 4 weeks or so before we start to see these changes take place.