diy vape juice

Hi, Today I made my first batch of Watermelon Gummies by BLCK. Used 100mg/1ml Nic Salts. I mixed it at 30mg and the flavour is really poor not strong enough. Can someone please look at this recipe and tell me where I went wrong? Mixed 50/50. -Watermelon Candy (TFA) 4% -27 Bears (CAP) 2% -Cotton...