Excluding rows or columns from Checkbox macro

So, I have based a lot of functions on a sheet on checkboxes. It grew beyond the original scope, and now I needed to add a few more control textboxes The problem is, I wrote a script which would Unmark blank checkboxes if a cell in the row was blank (the cell in G column), and now that I have a few more checkboxes to control other functions, my script unfortunately affects the others. Here is the script:

Sub UnMarkBlankCheckBoxes()

Dim chk As CheckBox
Dim ws As Worksheet

Set ws = ActiveSheet

For Each chk In ws.CheckBoxes
    If ws.Range("G" & chk.TopLeftCell.Row).Value = vbNullString Then
        chk.Value = False
    Else
        chk.Value = True
    End If
Next chk

End Sub

I need to be able to either select within a specific range (only column E), OR Exclude everything else. I have been trying things, but cant get it to work. Any ideas? Thanks in advance!