Great log bro.

If you don't mind me asking, what is your current goal? Please do share.

When doing chin up, neutral (hammer) grip is naturally easier than the underhand grip. Have you tried training chin ups using pyramid style?

That is indeed a great goal. Hope it works out well for you.

Oh i see. Maybe you can incorporate your chin training with isometrics and half reps. Together with pyramids, it really helped me on building chin strength when I was doing calisthenics. Tensing the abs and hips helps to have more work on the back while doing chins too. Just a bro advice. Keep up the great log buddy.