Network tuning on FreeBSD

I put FreeBSD 10.2 amd64 inside a VM with 2 CPU cores running on ESXi 5.5, and installed HAProxy and VMware tools. Idea was to get several hundred MB/sec per single TCP connection. Network is pure 10 GigE with low latency (RTT less than 10ms). Physical hosts running Linux act as client and server. My /boot/loader.conf on the proxy loads the stock vmx.ko instead of the driver that comes with VMware tools:

autoboot_delay=5
vmx_load="YES"
carp_load="YES"
hw.vmx.txnqueue=8
hw.vmx.rxnqueue=16
hw.vmx.txndesc=4096
hw.vmx.rxndesc=2048
cc_htcp_load="YES"
net.link.ifqmaxlen=2048
net.isr.defaultqlimit=2048
net.isr.maxqlimit=40960
# net.isr.maxthreads=2
# net.isr.numthreads=2
# net.isr.bindthreads=1

hw.intr_storm_threshold=9000
kern.random.sys.harvest.ethernet=0
kern.random.sys.harvest.point_to_point=0
kern.random.sys.harvest.interrupt=0
net.inet.carp.preempt=1
net.inet.tcp.cc.algorithm=htcp
net.inet.tcp.sendspace=1048576
net.inet.tcp.sendbuf_max=10485760
net.inet.tcp.sendbuf_inc=131072
net.inet.tcp.recvspace=1048576
net.inet.tcp.recvbuf_max=10485760
net.inet.tcp.recvbuf_inc=131072
net.inet.ip.fastforwarding=1
net.route.netisr_maxqlen=2048