I'm not saying you're wrong but I think the major fish kill was in the summer of 2009.
The specimen lakes are pretty prolific, IMO no need to bivvy up, best just to fish them from late evening til midnight(ish).
Pat's gets the most pressured but has the biggest carp (and cats), I'd guess averaging 15-18lbs.
Nelson's lakes (two small pools) is fished a lot less, carp average 12-16lbs.
Bait wise, make your hook baits big to avoid nuisance fish, there are millions of roach and skimmers, boilies 18mm+ or 20mm+ pellets.
Tactics, just fish tight to features (islands, lillies etc), use a fairly large pva bag loaded with mixed pellets and a few broken boilies (if using boilies as hook bait). To get around the lo-oil carp pellet only rule regards free offerings, simply soak your pellets in a bit of halibut or salmon oil because no one else will be using oily pellets, it gives you a real edge.
Like Cobelyn suggested, fishing the pleasure/match lakes in the evenings can pay real dividends and stalking is good on those lakes.
Best being Pollawyn and Sycamore, as Jenny's and Eery are now full of pasty sized fish and F1's.