Is Dbol really that bad for those who start a cycle with a not so lean physique?

I ask because I'm about to start my first cycle ever and I should be around 20% of bf.

This is it:

Test C twice a week for 12 weeks at least. Each those it will be 250-300 mg. I am just thinking in adding Dianabol during the first four.

I don't have a solid muscle base but I'm not too skinny neither. I've been working out since like 2013.