They sure as hell should test if they can create pressure without blitzing.
If they can, I simply wouldnt load the box turning most RPOs into runs which would play right into their hands. Hard to say if the Fins will maintain their stance on a ~50/50 run/pass ratio on 1st down at home but if they do, and still get around 3.8 yards per attempt like they did vs NE, well the Bills will take that every single time. By comparison, the Fins were getting 9.1 yards per attempt passing on 1st down, but still opted to run more than pass on that down.
So yeah, dont send extra pressure and see if the Fins still try to run most of the time on 1st down, if they do, just let the Fins try and win a close game which plays in your favor big time.