Hi,
Dosing seems fine though you could maybe dose a touch more KNO3.
You're dosing K2SO4; There's also normally enough K in your N&P dosing to cover it, if you increase N a bit.
If you're using the KH/pH/CO2 table to judge CO2 level then you will probably find CO2 is low. This method depends on kH/CO2 being the only acid forming compounds present; this never holds true in an aquarium.
Try to get yourself a drop checker to more accurately gauge your CO2 level. You may be surprised.