Your stakes getting limited to 5 pounds is normal, in other words, they(bookmaker) doesn’t want your business. If staking 5P is worth your time then go for it, also you can get down more on game even as you’re gubbed by staking different lines such as -1 Spread, -2.5 spread, over 2.5, over 3.5 on the same game. Just make sure to change settings on your rebel account to remove only placed bet from your
feed.
Your bets getting voided; I’ve never used unibet but since they reserve the right to do so have gubbed your account, you shouldn’t be surprised. This’s normal.
Your settings are okay mate, maybe try increasing your odds range to 2.7 and increase minimum edge to 3.5 and 4.5(on weekends with time around 6 hours)