Holy Cow, you are the first. And the appropriate apologies from me that i assumed you were using pool store tests. Yes. *We* dont trust pool store tests. You did yours in a lab and i'll GLADLY take those lumps.
However. TDS and TC are useless metrics. The 8 + 4 is the hugely important part. 12 means absolutely nothing when it could be 6+6, 1+12, 10.0000000000000003 + 1.9999999999999997, etc.
Phos is an equally useless # 99.9% of the time. If your pool is properly chlorinated, algae can't grow in it. Tracking how much 'algae food' is present becomes moot.
And as much as i LOVE that you have lab access, it reeeeeeally helps us to all be on the same page so we still reccomend the Taylor kit. Nothing is perfect, but if we are all off the same amount, we are speaking the same language.
The PB needs to handle it for the first month for warranty purpouses. They wont botch anything too badly in such a short time. Keep FC away from minumum. It sounds ok-ish, but its not something you want to flirt with. We will help tweak anything when ito gets turned over to you.