I was there last Wednesday and did super well.
A whole wall of designer pants at Barney's was $20. I walked away with 8 pairs from J Brand, Current/Elliott, James Jeans, Rag and Bone & Mother. 7/8 were colored pants (black, white, orange, electric blue) and 1/8 was blue jeans.
Also at Barneys I grabbed a Helmut Lang and Trovata sweater for $30 and $20 respectively.
They also had a suede lime green PS1 bag for $799, which I was seriously lusting after. Sigh.
At the Prada outlet I scored a pair of Miu Miu wooden sandals with a silk blue print for $120.
James Perse is where I stocked up on various basics (tees were $19-39).
Lastly, at Chloe I got a white sweater for $100 (90% off) and two pairs of shoes (one nude strappy heel; one nude and black wedge) each about $60 (90% off). I'm lucky I have big feet (38.5-40) or I would have walked out empty handed.
Woodbury is totally up to luck. When you hit it at the right time, you walk out feeling like you robbed the place. My biggest steal there is still a pair of grey BCBG pumps for $9 from $300.
You did well & you are right, it is a hit or miss going there...