CZs were buffed - NPCs in there are much more combat-builds than before.
Are you sure they're buffed? When I was regularly doing CZ'd last year they were a massive challenge, more in terms of ships ganging up on me than anything else, though individual ships appeared to be much more dangerous. This was in a fully engineered Corvette. I return this year, same Corvette and it's easy. I thought at first, indeed I posted about it at the time, that the CG related CZ I was in had been deliberately made easier. However, it seems they're all easier than they once were. I persuaded my regular Wingmate to do a CZ with me, warning him how tough they can be. He turned up, a total CZ newbie and had no problems what so ever. He even went back to get his Sidewinder to come and play, it was silly.
Previously, I'd had to run away numerous times with a huge chunk out of my very tough hull as the enemies were outmatching me and doing such massive amounts of damage. When 3,500+ strong highly resistant, fast charging (relatively) shields are 50% gone in one volley from an attacker, well, that's tough. Sure, the Spec Op guys are pretty tough now, however, I've often taken on all four and won in the Corvette. I get beaten up a bit, but I win. Even non-Spec Ops guys were beating me up previously.
I do think the key to that old difficulty was the more ships the Player killed the more of the opposing faction would switch targets to the player. So, you really had to pace yourself and not kill too quickly. Now, I can plough through a CZ killing a ship a minute and there are no repercussions - unless I attack the Alpha Spec ops.
For me it's night and day between CZ'd a last year (tough) and CZ'd now (easy) no question. Bear in mind I was returning to the game after about a years break, so was rusty, yet it was still easier.
Scoob.