Hi Vega,
Tricky situation you got yourself into!
High pH breaks down the cells and releases the goodies, it does not powder the bark! But it can soften the bark to a great extent. One may be able to mash the bark in the basic solution using a potato masher and applying massive caution to avoid lye burns.
alternatively, you can neutralise the solution with some acid, strain the bark pieces, chop them finely and redo the STB adding more lye.
But it is also advised to not do anything at the moment; whole chunks of bark may not be as bad after all. So just leave the STB solution for a week, pull, and if the yield is grossly suboptimal then you can apply the above more drastic interventions in an attempt to increase the yield.
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