Wlen vs Len
charged 5b is good to push len away. You have to be very very patient, it seems almost like a CvS2 game, where you're Sagat against an A-Bison with meter ALL the time. Use a lot of a/b ice for pokes, using tk b ice can help against Len's jump ins. Never ever go against an air battle with Len. You'll just lose.
Wlen vs Wlen
This just turns into a snoozing poke fest where you can't do a combo because you're too far to combo into nerfed bnb. Utilize more spikes and pokes.
Wlen vs Warc
This is an awfully lopsided match in favor for warc. She has more speed, mobility, better moves to poke your limbs, and she can just zone you all day by jumping around doing onion rings. TK B ice spike is good if you anticipate an onion ring. It's bad enough you can't do real bnb against her, but she can just jump all day and kill you slowly.