I think you’ve done all you can. Ultimately, a bankruptcy attorney will make the determination whether to file or not after consulting the client.
Just make sure before you do the hand-off, let the client know that you are only telling them what taxes may be dischargeable. Say anything else bankruptcy is the province of the attorney. I had an issue with a client about this once. So learn from my mistake.
As an aside, anyone who reads this, get Morgan King’s Discharging Taxes in Bankruptcy. I know most of you aren’t bankruptcy attorneys but it has some great information on reading transcripts and doing the bankruptcy discharge analysis.