If you are using a premixed blend, then you are kinda stuck unless you dilute the nic content with a flavor concentrate & that could change the flavor altogether.
If you mixed your own juice then you can add more flavor & more nic juice to keep the nic strength the same & have more flavor, providing you also used extra PG or VG base etc & don't add more base to the revised mix.
PG generally gives a better flavor than VG but VG tastes sweeter & produces more vapor. The trick is to find the ratio of these that suits you best.