Freshly planted 75g, New to plants and co2

[VJVentrella]

I just set up a planted 75 gallon with a co2 system. I have a few concerns that i was wondering if i could get some help. My Ph of my aquarium is 8.05, my ph monitor is set to a high of 8.15 and a low of 7.75 with a center value of 8. Now the co2 turns on when the ph is at or above 8.0. What I have noticed now is the the co2 comes on at 8.05 and cuts off at 7.75 however it take forever for it to come back up to 8.05 so the co2 is barely coming on if not ever. Is there something I should do to perfect this system? Again my aquarium water has a ph level of 8.05 after water conditioners and such. My kh is 89ppm (5) and my GH is 180ppm (9). Any suggestions would be greatly appreciated.

Also here is a list of the plant i added:
- giant hair grass
- 1 dwarf baby tears on a rock
- medium amazon sword
- medium green ozelot sword
- floating sensitive plant
- medium rotala indica
- green crypt
- red lotus
- lilaeopsis Mauritius
- jungle Val
- Anubias