Talking of combos:
2/8B+K 3A WS 3A WS 3B Prep BB BE - Highest guaranteed wall combo
2/8B+K 3A WS 3A WS 3B Prep BBB - Leaves them standing in a brilliant mix-up situation + position.
2/8B+K A+BA 66A+B - Highest guaranteed meterless combo - 1A follows well, and you can try and swap 66A+B for iPrep.
2/8B+K 3B Prep BB BE - NOT WORTH IT OUTSIDE A KILL
2/8B+K 3B Prep BBB
2/8B+K 3A+B:5 - Bit iffy, but can lead to some good range if you need to start something new. More than anything, this gets your opponent more tech happy, and traps follow.
Good needle use, kinda like 33B and others, can make you a tech trap monster. Once they want to stop doing that, you move onto other parts of your game.
Also, Needle shares a stun with CH 3rd hit 6BBB, so you can't have both in one combo or tech trap string - Just FYI - No CE, 2B, A+BA follow-ups.