It seems like a lot of CO2. So much so that I would think you have too much light if you have to run it that high or you don't have very good circulation. But if it's working for you and your fish don't mind then keep it up.
FWIW, in this years ADA catalog, there's a section on CO2 that includes a graph of CO2 levels in ADA tanks and CO2 levels peak around 14 ppm. I'm sure that's pretty dependent on their lighting levels and the plants they use though.
I'm pretty sure that was poor CO2 measurement and assuming the KH was actually all bicarb..........also, many doctor their parameters to suit the dogma, not the reality. Less is always perceived as "better" in many circles, aquarium books..........even if there's no real evidence to support this contention. Without some form of standard reference, such measures have no comparative measure to the true ppm.
Maybe it was 14ppm, maybe it was 35ppm, maybe it was taken AFTER the picture was taken and after they added lots of light for the photograph. All the CO2 is used up then. There are many many many unanswered questions there. I know what good plant growth looks like at various CO2 concentrations, few of ADA's tanks run at such low levels, that much I'm fairly confident of. You can rule you ferts and light fairly well and measure those easily. This leaves CO2 mostly.
I also curiously see very few fish in their tanks and of those, they are mostly highly CO2 tolerant.
And...the devil is in the details and methods.
I run a reference for CO2...........I think I might be the only person who has suggested and advocated this in the entire hobby, which is ......sad truthfully. Do not readily accept these things as truth/accurate.
I really do not know what a good ppm levels is for a general target, some tanks will have 70ppm, others at 45ppm, a few maybe 30-35ppm.....
Different plant species also have different non limiting CO2 [aq] ppm's.
Light greatly influences things, current etc.
It's not a simple thing folks go add 30ppm, it is easy to measure and that's all their is to it, many many make this assumption(Not you, I'm just commenting on the ADA claims , not you personally, fear not!)
RO/DI water in with a KH reference (say 1-10 liters) with CO2 added/well mixed and pH meter can make a decent CO2 reference.
This way you KNOW the pH and KH are well corrected for any error.
Adjust the CO2 flow and mark down the changes in pH/CO2ppm, then measure the tank's KH and pH, see if there is any differences.
I simply use a slow metered adjustment to target the tank's plants, I do not stress the fish out as the upper bound, the plants should respond nicely without gassing your fish.