Mid-split active on my node but S33 logs diplexer change as Ignored - what upload am I provisioned for?

I am on the Gigabit + Streaming plan in Boulder, CO 80302. I own my modem, an ARRIS S33 hardware V1.0, firmware TB01.03.001.10_012022_212.S3.

Comcast replaced the amplifier at my pedestal on August 25. It is a CommScope STARLINE FDX line extender, part FDX-LE-XX-XFX, manufactured 2026-05-05.

Since that work, my modem event log shows the CMTS sending diplexer mode change instructions that my modem is refusing:

CMSTATUS:US_Diplexer_Mode_Change_Ignored:TLV-21.1, 85MHz.

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

The only mode it accepts is 5-42 MHz. My upstream bonded channels are four SC-QAM at 16.4, 22.8, 29.2 and 35.6 MHz, with no OFDMA channel. My node appears to be mid-split enabled and my S33 is not, since the S33 is not on the Next Gen Speed Tier list.

Two questions:

1. What upload speed is my account currently provisioned for on this plan?

2. If I install a Next Gen Speed Tier modem, specifically a Hitron CODA56, will my provisioned upload increase on this same plan at this same price? What speed would it be?

I would also like a signal quality review. My downstream runs -6 to -8 dBmV, the OFDM PLC channel at 957 MHz is -13 dBmV with 38 dB SNR, and I have over one million uncorrectable codewords on several channels across two days of uptime. Upstream transmit is 51.8 dBmV on all four channels.

I am happy to provide my account number and service address by direct message.