Sorry to say that and don't want to sound sceptical or negative though
I have not seen yet a single measurement picture proof for neither girth or length.
All length measurement pics are cut and can't see clearly the measurement taken correctly.
Girth I didn't see at all.
You say the progress is slow altough you made tramendously unbelievable fast gains.
I havn't gain 1mm length or girth in the whole last 12months or more.
What device are you using to train? Are you cut or uncut?