Tax Roundup Issues

We are still having issues with rounding of fields using the {{this[‘priceWithTaxHtml’]}} field. This is an issue on individual products and when multiple products are added to cart (they look to be rounded but when added to cart show ‘.99’ or similar. Has anyone found a work around for this?

The only thing I can think of is to run to 3 decimal places but when there is no way to download the products to fix this in bulk and the site has nearly 500 products this is not an option.