Syncing Screens without BrightAuthor

We're creating a networked video wall with 12 screens. We're trying not to use BrightAuthor because we're working on Macs and we want the ability to easily swap out files. We've successfully used a similar script before, but now things are always a little off. We've updated the firmware on the brightsigns and have tried adjusting the frame rate and codecs, but nothing works. There is always a delay, but it changes from time to time.

Here are the specs:
Units: HD220s
Resolution: 1080p
Video Type: MP4 - H264 - 60FPS
Cables: HDMI

ANY IDEAS? THANKS FOR YOUR HELP.

Here is the master script we are using:

---

' Network Sync Script - MASTER

videoplaylist = "D03-B.mp4"

nc = CreateObject("roNetworkConfiguration", 0)
nc.SetIP4Address("192.168.1.32")
nc.SetIP4Netmask("255.255.255.0")
nc.SetIP4Broadcast("192.168.1.255")
nc.SetIP4Gateway("192.168.1.1")
nc.Apply()

v = CreateObject("roVideoPlayer")
p = CreateObject("roMessagePort")

v.SetPort(p)

mode = CreateObject("roVideoMode")
mode.SetMode("1920x1080x60p")
v.SetLoopMode(false)

ao = CreateObject("roAudioOutput", "Analog")
v.SetPcmAudioOutputs(ao)
v.SetVolume(0)

sender = CreateObject("roDatagramSender")
sender.SetDestination("255.255.255.255", 11111)

sync_the_videos:
    sender.Send("pl")
    v.PreloadFile(videoplaylist)
    sleep(5000)
    sender.Send("go")
    v.Play()
goto listen

listen:
    msg = wait(0, p)
    if type(msg) = "roVideoEvent" and msg.GetInt() = 8 then
        sleep(5000)
        goto sync_the_videos
    endif
goto listen

while true
    sleep(10000)
end while

---

Here is the slave script we are using:

---

' Network Sync Script - FOLLOWER

videoplaylist = "D03-C.mp4"

nc = CreateObject("roNetworkConfiguration", 0)
nc.SetIP4Address("192.168.1.33")
nc.SetIP4Netmask("255.255.255.0")
nc.SetIP4Broadcast("192.168.1.255")
nc.SetIP4Gateway("192.168.1.1")
nc.Apply()

v = CreateObject("roVideoPlayer")
p = CreateObject("roMessagePort")

v.SetPort(p)

mode = CreateObject("roVideoMode")
mode.SetMode("1920x1080x60p")
v.SetLoopMode(false)

ao = CreateObject("roAudioOutput", "Analog")
v.SetPcmAudioOutputs(ao)
v.SetVolume(0)

receiver = CreateObject("roDatagramReceiver", 11111)
receiver.SetPort(p)


listen:
    msg = wait(0, p)
    if type(msg) = "roDatagramEvent" and msg = "pl" then
        v.PreloadFile(videoplaylist)
    endif
    if type(msg) = "roDatagramEvent" and msg = "go" then
        v.Play()
    endif
    
goto listen

while true
    sleep(10000)
end while