Cool! I've been using 2.5 flash and it is pretty bad. 1 out of 5 answers it gives will be a lie. Hopefully 3 is better

Did you try with the grounding tool? Turning it on solved this problem for me.

what if the lie is a logical deduction error not a fact retrieval error

The error rate would still be improved overall and might make it a viable tool for the price depending on the usecase.