SiO2 charging spec says 27 amps for 100 AH batt, but some write-ups say you can go way higher if you don't do it for too long or maybe too often, it is really unclear. I have no reason to try and find out how high is too high, so 27% charging rate is fine with me.
I find it strange that the SiO2 has such a high discharge rate allowance, but they don't specify a higher charging rate. With FLAs it is the same each way, around 25% most seen as recommended (but 10% for most cycles "lifetime"--which is fine on shore power, but no good for generator time that you want to keep to a minimum while restoring the most AH)
With any FLA, your SOC when Bulk ends and amps start to taper depends on the charging rate of course. So with a very high charging rate, amps would taper at a low SOC anyway.
There was a graph somewhere in one pf the LFP write-ups that gave the SOC when amps tapered using 1C charging rate. ISTR it was in the 70s or 80s. So the claim you stay in Bulk up to near full must be with a lower charging rate. Don't have any info on that.
(Been trying to work Darwin's Law into this somewhere, but no luck)