Just going back a step to the incorrect RDS. Reading the FM Player notes. Have you installed this patch below, if using Windows 7?
Have & do use Welle-io with a RTL-SDR dongle with same realtek chip. Difficult gaining better SNR on 9A DAB+ to be honest compared to figure you obtain. Depends on many factors I think, some others do better. I tried it with DAB+ bandpass filter that was almost perfect for just 9A band & it made no difference what-so-ever with the dongle SNR figures.
These 8bit dongles don’t perform as well as a dedicated higher end device like an Airspy R2 etc, whilst only 12 bits, it would/does perform much better than the dongle.
I’m hoping a higher end wideband Airspy device to replace it, will happen sometime in the near future.
As to other programs there’s also QIRX & SDR-J (the later is easier to get going from memory) that decode DAB+ - if that helps?
Back on the FM performance of the RTL dongle, you definitely have to tinker with the config gain settings for nearly every frequency channel to get the best performance from it.