I've routinely add about 2-10X the maximum trace mixes without even noting any issue.

I dosed 200mls in a 20 gallon tank of Flourish.
I dosed 20mls of TMG in a 20 gallon 3x a week for 4 weeks.

Spirogyra is not that bad but seems like the CO2 could use some work, adding more current might help or changing the existing current routine.

Go in there and try to prune it out really good and then stick to good routines thereafter, with special attention to CO2.

So you are wasting the traces if adding more under non limiting conditions.
Since it cost more than KNO3, this is a real issue.

Most do not want to waste traces or light.

Regards,
Tom Barr