So do I. I file for an LLC, an individual, and a partnership. I have still never been audited, perfect return or not. They are not that difficult. Call any IRS agent, CPA or tax attorney and you will get different answers all the time. The system is based on trust. While many people cheat, using all the legal loopholes and advantages will not cause a defective return.
By the same token, there are supposed to be a certain number of random audits, so it wouldn't matter if the return was perfect or not. You might avoid a flag-based audit, but still get hit by a random audit.
I don't worry about. Much.