Bandwidth shaping/capping issue on my Comcast business line

 I am paying for a 100/20 business connection and while I have no issues getting those speeds from speedtests/cloud providers/etc anytime I try to directly transfer data to my parents and/or friends my bandwidth is cut in half. This only seems to happen to places that I have transfered a bunch of data too/from in the past. It has gotten to the point where it's faster for me to send data via an aws instance in Ireland than it is to go across the country. (Forgive the formatting below)

[testing@speed ~]$ # My parents fios connection (have xfered a bunch in the past)
[testing@speed ~]$ scp 256MB.file parents-fios:~
256MB.file 100% 244MB 1.3MB/s 03:05

[testing@speed ~]$ # A 2GB friend fiber connection in nyc (have xfered a bunch in the past)
[testing@speed ~]$ scp 256MB.file nyc:~
256MB.file 100% 244MB 1.4MB/s 02:58

[testing@speed ~]$ # 1G Fios Friend
[testing@speed ~]$ scp 256MB.file friend-fios:~
256MB.file 100% 244MB 2.8MB/s 01:27

[testing@speed ~]$ # Azure east instance
[testing@speed ~]$ scp 256MB.file azure-east:~
256MB.file 100% 244MB 2.7MB/s 01:31

[testing@speed ~]$ # AWS Canada Central
[testing@speed ~]$ scp 256MB.file aws-ca-central-1:~
256MB.file 100% 244MB 2.8MB/s 01:26

[testing@speed ~]$ # AWS Ireland
[testing@speed ~]$ scp 256MB.file aws-eu-west-1:~
256MB.file 100% 244MB 2.5MB/s 01:39

[testing@speed ~]$ # Send my file to nyc via azure east
[testing@speed ~]$ scp -oProxyJump=azure-east 256MB.file nyc:~
256MB.file 100% 244MB 2.8MB/s 01:28
Killed by signal 1.

[testing@speed ~]$ # Send my file to nyc via canada
[testing@speed ~]$ scp -oProxyJump=aws-ca-central-1 256MB.file nyc:~
256MB.file 100% 244MB 2.8MB/s 01:27
Killed by signal 1.

[testing@speed ~]$ # Send my file to nyc via Ireland
[testing@speed ~]$ scp -oProxyJump=aws-eu-west-1 256MB.file nyc:~
256MB.file 100% 244MB 1.7MB/s 02:21
Killed by signal 1.

[testing@speed ~]$ # Send my file to the parents via azure east
[testing@speed ~]$ scp -oProxyJump=azure-east 256MB.file parents-fios:~
256MB.file 100% 244MB 2.8MB/s 01:27
Killed by signal 1.

[testing@speed ~]$ # Send my file to the parents via Canada
[testing@speed ~]$ scp -oProxyJump=aws-ca-central-1 256MB.file parents-fios:~
256MB.file 100% 244MB 2.7MB/s 01:30
Killed by signal 1.

Oddly enough I am "allowed" to do two simulatious transfers (each at half speed) to the parents/nyc.  What is going on?