That's kind of hard to do with low mags since an opponent who is used to Haku pressure will easily jump out once they know where the holes in your pressure are. 2A>6B/2B>Kishuu>2B,6B,2A/5A>tick throw/TRM,5A whiff>grab/6B,5B>special/jc etc.; 2A>step 2A/2C>Kishuu/Guren,2B,6B etc. are some low mag using mix up/pressure blockstrings that can work out but as Hakumen you really should concentrate on keeping the opponent honest more so that you can get more free mix ups and pressure on them. If you start noticing them blocking every bit of your mix up, then maybe you should start doing more different kinds of stuff, if they still mash out or jump out of your pressure then you shouldn't be afraid of wasting meter on your blockstrings into Renka, Tsubaki, Hotaru and maybe Zantetsu to keep them more cautious of your options.