USB-UIRT slow output for U-verse VIP1200 on SageTV

I added a U-verse box to my Sage server, installed the USB-UIRT and it's Win7 v2.02.16 drivers. I added the IR codes from HERE, as well as set the Remote Control Options according to ShadeBlue's recommendations. I've installed ShadeBlue's STBKeepAlive utility, which has fixed the VIP1200 sleep issue.
Channel changing is S----L----O----W... About 2 seconds is added to the inter-digit delay set in the SageTV remote options. It'll work perhaps half the time, but often changes channels before receiving the last digit. This causes an attempt to change to 125, to briefly go to 12, then to 5.
When I first set this up, I had 3 digits per channel set, but it would always drop the first digit. After changing to 4 digits per channel, the leading 0 gets dropped, then the following 3 digits are picked up. By dropped, I mean the first digit is displayed on screen, but the display starts over again for the following three digits. Well, when it doesn't break it up further due to the slow input.
I've tried:
Uninstall/re-install USB-UIRT drivers
Adjusting Remote Control Options up/down
Changing Sage.Properties values up/down for:
usb_irtune_repeat_factor
usbuirt_irtune_global_preroll
I've also posted on the SageTV forums, but this issue might be USB-UIRT driver related?
Channel changing is S----L----O----W... About 2 seconds is added to the inter-digit delay set in the SageTV remote options. It'll work perhaps half the time, but often changes channels before receiving the last digit. This causes an attempt to change to 125, to briefly go to 12, then to 5.
When I first set this up, I had 3 digits per channel set, but it would always drop the first digit. After changing to 4 digits per channel, the leading 0 gets dropped, then the following 3 digits are picked up. By dropped, I mean the first digit is displayed on screen, but the display starts over again for the following three digits. Well, when it doesn't break it up further due to the slow input.
I've tried:
Uninstall/re-install USB-UIRT drivers
Adjusting Remote Control Options up/down
Changing Sage.Properties values up/down for:
usb_irtune_repeat_factor
usbuirt_irtune_global_preroll
I've also posted on the SageTV forums, but this issue might be USB-UIRT driver related?