OP i suggest you grab a datalog just to be sure everything is performing as should be. It's hard to give solid advice on whether or not to make a purchase when it could be a problem with hardware isn't going to be fixed by a FMIC. With that said, i do HIGHLY recommend picking up an IC anyway, the stock unit is absolute garbage.
"I'm not surprised you get along well with all the other neighbours. If you put fifty children with Down's syndrome in a room there is going to be a lot of hugging." David Thorne