You're fine. The 8300pps mark is not an upper limit, it's the best case
for a full 100Mbit ethernet link (ignoring jumbograms).
Yes, depending on limitations of your firewall hardware, pf ruleset,
size of state table, etc.
For this you will need a reasonably fast box with good gigabit ethernet
cards (em or sk), and an intelligently written ruleset. It seems like
you're a long way away from 200k pps, though.