Multi display issues - slow configuration and random repositionings

[luispabon]

xrandr.txt
monitors.zip

i7-7700HQ & intel graphics

Distribution - (run cat /etc/os-release):

NAME="Pop!_OS"
VERSION="19.04"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Pop!_OS 19.04"
VERSION_ID="19.04"
HOME_URL="https://system76.com/pop"
SUPPORT_URL="http://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=disco
UBUNTU_CODENAME=disco

Related Application and/or Package Version - (run apt policy $PACKAGE NAME):

~ apt policy hidpi-daemon                                                                                                                                                           Wed 24 Apr 2019 10:52:10 BST
hidpi-daemon:
  Installed: 18.04.4~1533160664~19.04~85d4567
  Candidate: 18.04.4~1533160664~19.04~85d4567
  Version table:
 *** 18.04.4~1533160664~19.04~85d4567 1001
       1001 http://ppa.launchpad.net/system76/pop/ubuntu disco/main amd64 Packages
       1001 http://ppa.launchpad.net/system76/pop/ubuntu disco/main i386 Packages
        100 /var/lib/dpkg/status

Issue/Bug Description:
I have 3 monitors. A built in 4k display, and two identical 1080p monitors, one connected straight into HDMI and another into thunderbolt via a DP-to-USB-C connector cable. External monitors are positioned side by side, and laptop display is beneath in the middle.

Daemon is very slow to work out what to do with the displays. X picks them up quickly enough, but then they show a black screen with a cursor for about 15 seconds until gnome shell shows up, this happens upon resuming from sleep or unlocking after a while idle (but not suspended - in this case, the external displays went to sleep).

Positioning of the displays is off upon resuming from laptop sleep. It's always the laptop's display that's off and to the left (see screenshot below). Sometimes, opening gnome's settings triggers this same display repositioning, especially on long sessions (+24h).

The refresh rate in that screenshot is wrong, display is at 60hz (that looks like a gnome issue tho).

Noe of these issues happen when disabling the hidpi daemon.

Steps to reproduce (if you know):
See above.