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Good point and nice estimation! Measured bits/spike (e.g. in cricket sensory neurons) tops out at 3.2 bits/spike [1]. Most sensory neurons across all species top out at ~300 bits/second.

So if we assume a similar bit rate for spine neurons, we get 7.5 GBps, not 16.625 GBps.

[1] : https://www.nature.com/articles/nn1199_947

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Though, it probably never reaches even remotely full capacity except in rare events like seizures or when jumping into cold water. Also, there is a fair amount of redundancy in neural information processing due to the noisy computation substrate. I would not be surprised if the channel capacity is something like 100 Mb/s, but transmission rates are less than 10 Mb/s most of the time.

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