change watts

Hello all, I have just recently starting vaping a few weeks back. Was hoping someone could help me with an issue I have on a tank I recently purchased. When I first started a few weeks back, I purchased a Segelei 213 mod that came with a starter tank and coils. I have used it quite frequently...

I'm thinking of switching from my Dovpo E-LVT. Someone said its a 30w mod. I'm a newbie so this might be dumb. I have a kanger sub mini tank and it has good taste for 1st 3-4 hits then it taste burnt and warm not burnt coil taste just burnt juice. Someone said use a Hercules tank but I'll need...