Text symbols increase file size dramatically

I have an issue with a HTML5 banner with multiple instances of text layers. The output without symbols are about 90 kb, but if I convert the first instance of a text layer to a symbol and then replaces all other instances of that with the new symbol, the output has increased about 10 kb, quickly building up to 180 kb when all text layers are converted to symbols.

I noted that the .js file had twice the amount of code when the text was symbols.

I would like to keep to symbols, because it's so much easier to edit. But my output can't be bigger than 130-150 kb. Is there anything I can try?