He hasn't changed any sysctl settings. He still uses cubic!

Here's what I got:

# settings to compensate for horrible network connection
net.ipv4.tcp_congestion_control=westwood
net.ipv4.tcp_low_latency=1
net.ipv4.tcp_frto=2
# avoid swapping on SSDs
vm.swappiness=1
vm.dirty_writeback_centisecs = 6000
kernel.nmi_watchdog = 0
# more agressive congestion control
net.ipv4.tcp_congestion_control=westwood
# selective acks
net.ipv4.tcp_sack=1
# increase max length of processor input queues
net.core.netdev_max_backlog=250000
# increase TCP max and default buffer sizes
net.core.rmem_max=4194304
net.core.wmem_max=4194304
net.core.rmem_default=4194304
net.core.wmem_default=4194304
net.core.optmem_max=4194304
# increase memory thresholds to prevent packet dropping
net.ipv4.tcp_rmem="4096 87380 4194304"
net.ipv4.tcp_wmem="4096 65536 4194304"
# TCP low latency mode
net.ipv4.tcp_low_latency=1
net.ipv4.tcp_frto=2