I am confused, are the reported data from the set-up with the raspberry, or are these with the new device?
Anyway, it would be great if you could do the following (rub the command and post the output here):
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tc -s qdsic
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run a dslreports speedtest following these instructions on configuration and reporting.
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tc -s qdisc
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run a waveform speed/bufferbloat test and post the result link here
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tc -s qdisc
to see how/if cake's counters match eith what we expect from the test.
Also please note that 2100/800, or 2.1/0.8 Mbps is really really slow and will have unpleasent latencies from the serialization delay alone, at that level of internet access you need to manage your expectations and accept some level of pain...