Big Chewie has bitten the dust I'm afraid. But Boba Fett escaped the Sarlacc so there's a bonus.
If your gonna start reading em, ease yourself in with the "tales of": -
Mos Eisley Cantina
The Bounty Hunters
Jabba's Palace.
All short, interwoven, stories that relate to characters seen on sceen from the movies (however brief thier appearance!).
Don't dismiss it without reading the story dude, he's half digested and escapes kinda in the same way he ends up in there - down to something in his jet pack going off.
If you like that story then you can find out more about how he escapes Tatooine when he's on deaths door if you read the Bounty Hunter Trilogy. Although that is a heavy read in my opinion cus' all the plotting, double and triple crossing can be hard to keep up with. 😕
Yerssot means the Bounty hunter THAT found him, Tomacco. Although Foce Witch ARE in the EU (just ask Edna...)
But you are right. The return of Boba Fett and the cloned return of the Emeror were not exactly the high points of the EU.
Luckily, many other EU books have successfuly brought in decent enemies of their own.