Thanks for setting up this Super Feed, great location sounds very good !
I notice the audio seems to be skipping at times, similar to what was happening with the Swiss Super Feed when it was first set up.
"LOWW ACC 118.730" - this frequency used to cover the "S" Sectors (FL350 and above), but was changed to 133.965 a few years ago. I checked a sampling of 118.730 archives and there was nothing on them. For some reason this feed is one of the most listened to, had 10 users on it yesterday, but there was nothing being heard on it ?
If you have the bandwidth and can squeeze in a few more feeds, the high airspace directly overhead the Vienna area (E Sectors) are not covered. I suspect you should be able to get controller reception on all or some of these frequencies ? They are currently using 134.440 (FL250 to FL340), 135.635 (FL350-FL360), and 133.985 (FL370 and above).
https://eaip.austrocontrol.at/lo/190104/Charts/ENR/LO_ENR_6_6_en.pdfJS