Upvote:3
If the Working Holiday application has already been submitted (and the fee has been collected) and you believe the application will be refused, you can withdraw it if a decision has not been reached.
Applying for a visitor visa shortly afterwards is perilous. Serial applications often suggest a secondary agenda which is unrelated to tourism or business. Based upon what you wrote, your agenda would be to maintain a relationship with your bf and stay the whole time in Perth. Is it really tourism? To make matters worse, you did not comply with the terms of your WHV in your previous stay.
So to answer your question: 'what do you think my changes of being granted...', I think they are poor. Your application would need supporting evidence to show your solvency and readiness to return to England in order to be successful.