The other main factor is the size or volume of the pot, and the volume of application of the liquid fertilizer per pot.
ie 500 ml per pot of the liquid fertiliser mix (at 1/2 tsp per gal per watering).
assuming 1/2 tsp is 2.85 grams of fert powder.
Thinking that you water/fertilize weekly on average, ( It's probably more ?? )
with a 25 N fertiliser, you should be getting good growth ??
Unless you have winter heating, you may want to lower the fertiliser application in winter if the plants aren't too active.
As you probably water less frequently in winter without heat, the applications are reduced anyway.
How long have you been applying this fertilizer regime, and how do you like the results ??