your 3800 is outperforming the ac1900 across the board at this distance????
Wired, 3800 running the latest LEDE snapshot, and the ac1900 running the OpenWRT CC release. They have _slightly_ different SQM settings, though:
3800:
LEDE 2016/12/22 snapshot
"piece of cake"
135Mbps down
12Mbps up
DSCP no squash, don't ignore on ingress
ECN
wrt1900ac:
OpenWRT Chaos Calmer rc2
simple.qos
160Mbps down
12Mbps up
DSCP no squash, allow on ingress
ECN
So I'm running a single-queue on the 3800, and multi-queue on the wrt. The WRT has always counted bytes in an "off" manner, limiting to _far_ below the set level. Unlimited on this modem is up at 180Mbps downstream today.
Today's tests with LEDE on the 3800 were a warm-up for moving the wrt1900ac over to LEDE. But I wanted a backup in case something goes awry (nearly bricked the 3800 as I forgot to uncheck "keep settings" on the OpenWRT->LEDE upgrade.