Cal issue is resolved, I'll patch my ROM. If I don't break anything soldering, I'll report back what happens in a couple days.
Cal data was organized into blocks. I had a thought autocal probably manages some of these blocks too:
[factory addr=0x7f0000 sz=2546 csum=0x48242,
spc addr=0x7d652c sz=1564 csum=0x1bc53,
trig_fpc addr=0x7d0000 sz=396 csum=0x11750,
fiso_fpc addr=0x7d01c2 sz=11088 csum=0x15232b,
fiso_fpc_peak_detect_5US addr=0x7c0000 sz=11088 csum=0x14bae7,
fiso_fpc_peak_detect_10US addr=0x7c2b8e sz=11088 csum=0x16344a,
fiso_fpc_peak_detect_25US addr=0x7c571c sz=11088 csum=0x158a91,
fiso_fpc_peak_detect_50US addr=0x7c82aa sz=11088 csum=0x160cb1,
fiso_fpc_peak_detect_100US addr=0x7cae38 sz=11088 csum=0x15a601,
fiso_ch1_sample_offset addr=0x7d3d54 sz=2673 csum=0x1e307,
fiso_ch2_sample_offset addr=0x7d493e sz=2673 csum=0x105c,
fiso_ch1_pkdet_offset addr=0x7d2d50 sz=1980 csum=0x3d7d1,
fiso_ch2_pkdet_offset addr=0x7d3552 sz=1980 csum=0x325,
fiso_ch1_pkdet_lkup_corr addr=0x7d5528 sz=1980 csum=0x3dc38,
fiso_ch2_pkdet_lkup_corr addr=0x7d5d2a sz=1980 csum=0x3d71a,
trig_fpc_2 addr=0x7e0000 sz=396 csum=0x12bd9,
fiso_fpc_2 addr=0x7e01c2 sz=11088 csum=0x129b8a,
fiso_fpc_2_peak_detect_5US addr=0x7d6d60 sz=11088 csum=0x132c93,
fiso_fpc_2_peak_detect_10US addr=0x7d98ee sz=11088 csum=0x13408d,
fiso_fpc_2_peak_detect_25US addr=0x7dc47c sz=11088 csum=0x132590,
fiso_fpc_2_peak_detect_50US addr=0x7e6590 sz=11088 csum=0x1307bf,
fiso_fpc_2_peak_detect_100US addr=0x7e911e sz=11088 csum=0x12e5b2,
fiso_ch3_sample_offset addr=0x7e3d54 sz=2673 csum=0x47bef,
fiso_ch4_sample_offset addr=0x7e493e sz=2673 csum=0xf97,
fiso_ch3_pkdet_offset addr=0x7e2d50 sz=1980 csum=0x9e6d,
fiso_ch4_pkdet_offset addr=0x7e3552 sz=1980 csum=0x184af,
fiso_ch3_pkdet_lkup_corr addr=0x7e5528 sz=1980 csum=0x3d78f,
fiso_ch4_pkdet_lkup_corr addr=0x7e5d2a sz=1980 csum=0x3f20e]
The 4 sections who's size change when upgrading to 2GS/s are `fiso_ch?_sample_offset`. I did an auto cal, and observed checksum changed for those.