Dave is it possible to offset the frequencies slightly so that the selcal decoders will work? Some radios seem to suffer from this where the frequency displayed isn't actually bang on. From looking at where the spikes are landing on the decoder spectrum I'd take a guess that the freqs need increasing by around .04 khz, ie. 8915.04. This won't make any noticeable difference to the voice audio, but the decoders will be able to do their job.
Just for your info if interested, your NAT HF radio feeds are very slightly below the actual freqs as the spikes on the spectrum are landing just to the left of the actual selcal letters. Fortunately the decoder seems fairly happy decoding them as it stands, but to be spot on freq you need to drop maybe .005 to .01 off, eg. 5615.99 or 5615.995. Sounds like a pathetic amount, I know, but I know that those people who are using Airnav decoder or the Skysweep will be getting constant bad decodes from your feeds as neither decoder has any leniency for 'under' freqs and will decode the next higher letter, eg. if the actual selcal is BCDE then they will show ABCD. No such problems using my multiPSK decoder though
By the way, the audio on that feed is still VERY quiet. Volume on max here and only getting faint mumblings.