Centering a cluster and a few nodes inside of another cluster

[v1nsai]

I'm having trouble figuring out why this diagram is coming out so lopsided. I've experimented with layouts but I've been stuck for a while now. Could someone advise how to make this more symmetrical? I'm aware of using neato layout and position numbers to hard code it as outlined here but I'd like to avoid that if possible. Thanks for any advice! Also, I'm aware that the color scheme is horrific I just needed a quick and dirty dark mode to work in.

from diagrams               import Diagram, Cluster, Edge
from diagrams.generic.os    import Ubuntu, Windows
from diagrams.k8s.infra     import Master, Node
from diagrams.k8s.compute   import Deployment
from diagrams.k8s.storage   import StorageClass

diagram_attr = { "fontcolor": "white", "bgcolor": "black" }
with Diagram("Homelab", graph_attr=diagram_attr) as diag:
    baremetal_cluster_attr = { "fontcolor": "white", "bgcolor": "gray20" }
    with Cluster("Bare Metal Servers", graph_attr=baremetal_cluster_attr) as baremetal_cluster:
        server_attr = { "fontcolor": "white" }
        bigrig      = Windows("bigrig",     **server_attr)
        oppenheimer = Ubuntu("oppenheimer", **server_attr)
        ASUSan      = Ubuntu("ASUSan",      **server_attr)

    k8s_cluster_attr = { "fontcolor": "black", "bgcolor": "gray40" }
    with Cluster("MicroK8s Cluster", graph_attr=k8s_cluster_attr) as microk8s:
        k8s_node_attr = { "fontcolor": "black" }
        master1 = Master("oppenheimer", **k8s_node_attr)
        node1   = Node("bigrig",        **k8s_node_attr)
        node2   = Node("ASUSan",        **k8s_node_attr)

        deploy_cluster_attr = { "bgcolor": "gray60" }
        with Cluster("Kubernetes Deployments", graph_attr=deploy_cluster_attr) as k8s_deployments:
            deploy_node_attr = { "fontcolor": "black" }
            plex    = Deployment("plex", **deploy_node_attr)
            nfs     = StorageClass("nfs", **deploy_node_attr)

    master1     -  Edge(color="gray20")     - [node1, node2]
    oppenheimer >> Edge(color="dodgerblue") >> master1
    bigrig      >> Edge(color="dodgerblue") >> node1
    ASUSan      >> Edge(color="dodgerblue") >> node2

diag