Creating an iRule with different multiple ports for one VIP

You're saying: if (the local port is 799 AND 8914) OR (local port is 3000 AND 3050), then allow it.

Try this:

when CLIENT_ACCEPTED {
    switch [TCP::local_port] {
        "799" -
        "8914" -
        "3000" -
        "3050" { return }
        default { reject }
    }
}

You also shouldn't need the pool statement there if you have the pool assigned to the VIP.