Hello
I would be able to help you with your spreadsheet. I would suggest either
1) including details of each bet (eg stake, odds, win/lose, returns, start balance, end balance)
or
2) as you suggested with balance amounts but then include any deposits/withdrawals to your account. That would show if the balance is inflated because you actually won money rather than just put more money into your account.
If you're interested in either of these approaches, or something else for that matter, please let me know and I can implement them for you asap.
I hope to hear back from you soon.
Kind regards
Steve