PH too high or what?

I made some changes to the tank and took the advice of some others.
Tank specs:

20 Gallon
65 Watt light - 6700k bulb
7 hours
200 Marineland Bio Filter
3 Liters of DIY Co2 replaced every 10 days.
Venturi from Red Sea CO2 kit

Biomass:

2 bunches of Moneywort
5 - 6 stems of Cabomba
Marble Vals
2 bunches of red temple
amazon sword
ruffle sword
red rubin sword
anacharis

Dosing:
EI Method for 20 gallon tank.
M, W, F - 1/8 tsp KNO3, 1/8 tsp of K2SO4 - I'm still waiting on my phosphates but am planning to dose 1/16 tsp.
T, Th - 1/16 tsp of CSM+B plus 1-2ml of liquid fert iron (flourish)

I did the PH 24 hour plan to see what my PH was and when I first did it, it was 7.8... next day 8.0... doesn't make sense, thought it was suppose to drop. Using API freshwater master test kit.
Nitrates - 20 - 40 ppm (color blind so hard to tell which one its closer too).
GH is high - around 15 and KH is low around 3 or 4...

I had black beard algae, and should I trim the parts that were on the leaves? My plants are pearling and growing, but not lush green, and the lower leaves on my temples are a little brown, and moneywort as well is not as green on the bottom. Could flow be a problem? I'm still getting algae on the glass as well. Since I'm missing phosphates in my dosing, can this cause algae? The other algae is growing on my rocks, like a small green patch.. no hairs though. A planted tank is hard work... I just want it to be lush green.

 

The phosphates should be here very soon... but I will look into the liquid one. Should I trim all the leaves that have algae on them? Also, is 3L of CO2 enough for a 20 gallon tank with this biomass?