If you are dosing KNO3, then no.
The PPS-pro dose of KNO3 adds 0.6ppm of K. PPS-pro calls for 1.33ppm of K.
You're 29grams K2SO4 in solution is adding 0.75ppm K. So combined you reach your target of 1.33ppm K.
However, KH2PO4 also adds K. With standard PPS-pro dosing of KH2PO4 you can neglect it's contribution to K since it's minimal. But since your boosting phosphate to reach 5ppm, this will be adding significant amounts of K. A 2ppm dose of KH2PO4 adds 0.8ppm K.
TLDR: No, stick to your current solution of K,
and don't add any K when adding lots of P.
edit: Just noticed your current KH2PO4 dosing. Just stick to your current solution of K2SO4 and dose as per recommendation.
Last edited by Audionut; 10-21-2015 at 02:23 AM.
Reason: I learnt how to read properly