[amsat-bb] Improving performance of packet communications through the ISS

I've got my Icom IC-910H working with it's SignaLink interface, through Packet Engine Pro and UISS. I've been able to receive lots of stations through the ISS, and managed to have short QSOs with a couple. Fun!

But I notice that this combination seems to do a poor job of decoding weak signals. I hear packets in the speaker that seem plenty strong enough to decode, but they don't show up on UISS.

I'm wondering if I used a traditional TNC, such as a Kantronics unit, if I'd get better performance? Does anyone in the group have any experience along these lines? Or could someone provide other suggestions on how to improve my ability to communicate through the ISS?

Thanks in advance. Having a ball on the birds.