When you try to sign a transaction from a wallet the output transaction is the one leaving the wallet so basically in the process of signing if the net amount of coins in the wallet isn't able to pay for that transaction that is when you should get such a message. From your image you seem to have increased the slippage like you said but I believe a there should be something else making the output not adding up.

Gwei is related to Ethereum and ETH has high fees especially for their tokens so I suggest you reduce the withdrawal speed probably to standard in the image there just to lighten the output a bit by reducing the fees you would be paying.