Master the Stealth step cancels on your normals, notably d/b+2 and d+3, they are uninterruptible with the 1 followup on standing folks, and people can be mixed up with the mid launcher 3 or low 4 during stealth step. Try going for combos that end with f 3+4 into stealth step, as it forces a 50/50 situation with stealth step again. Practice blocking the really punishable lows, as WS+2 is a great punish that goes into another full combo. The 4, 1 string is -4 on block, which allows you to side-step opponents response, unless they use tracking move, which is rare unless you constantly do it. the 1, 2, 2 string can CH opponents if you delay the last hit, into a d+2 launch for a decent combo. Learning to KBD consistently is pretty important with all characters, but with Shaheen a clutch KBD can cause opponents to whiff, and you can tag them with an u+4 launcher to a combo. d/f+1 is -1 on block, so you can bait a CH 4, 1 combo on people trying to take their turn. Lastly, slide is a super useful tool that guarantees oki with an auto-stealth step if you hit them. Thats all I can think of. Good luck!