Oh, the famous pr0zac's band of cowards. It's funny, like you say "numerical and firepower superiority in Dutch favor", when all battles with pirates 3rd rates I've been yesterday were like 2000 BR Pirates vs 1000 BR Dutch.
I've been in 3 engagements with Pirate 3rd fleet yesterday. In all engagements (2 near Blanquilla, 1 near Saint Georges) Pirates had way more firepower (like 1 3rd Dutch + 3/4 Frig vs 4 Pirate 3rd rates + 1/2 Frigs). Yep, unfortunately our main forces were busy (like, you now, fighing PB like ships of the line should do).
But even with this great BR superiority I couldn't remember any member of Dutch screening fleet to be sank in those engagements (maybe you've got lucky in other battles). One battle I was rammed by the pirate Frigate, then had to sail in my trinc through 3 pirate 3rd rates (to catch downwind) and still was able to get away - you guys are a lousy shooters. Oh, and when you whine in battle chat about trinco running away from 3 3rd rates, think - maybe you can take a frigate instead of a line ship, better to take a crafted when, not a disposable fir shit, and then you may have a chance to catch crafted trinco (of course when there will be 3 of you and 1 of me).
P.S. Don't worry, we will catch you pirate scum later. Currently we are busy with the Swedes, who turned out to be very well organized and equipped.