Can I adjust values shown on public profile?

Yes, you can set an "Earnings deduction percent" in your settings, right below the public profile link. Please note that this will affect only public profiles (and not the values shown on the dashboard) and that only the earnings will be deducted by a fee while hashrate will be shown as is. For example, setting of 10% will show 9 USD instead of 10 USD of earnings.

By setting earnings deduction percent to 100, the earning will be completely removed from the public profile.