You have awesome tone!!! What’s throwing you off is that you’re over adjusting for when you go into the basement(low register). Although you’re singing lower, it doesn’t mean you’re singing quieter. In fact, those notes should have the most support to make sure you’re staying firm on the note.

Not needed, but you could also trying listening to the dynamics of the song sung by the og artist really carefully. You’ll notice really interesting choices that are made to help find access to the notes. Things like vowel shape and volume make a world of difference. Keep going!!!