fds, I don't doubt your constant flaws experience. My Aussie states albums are not well sorted into watermark/perf varieties yet and many examples are lurking in my Aussie blocks album and my "to sort" albums as well as glassines. At least these are all clean soaked flat examples. will have plenty more in "collection boxes" I have yet to sort/soak.
I've made a start on condensing the information in this thread into something that I can use and others hopefully too for sorting mine. No idea when I will likely finish. I'm using other catalogues too to combine their information. I'll use the ACSC as primary information and there are a bunch of releases also catalogued by Gibbons. A lot of combinations too of colours (well shades making things tricky, the issue is only in Red). Perfs should universally be 12.5x11 and all issues seem to recorded as this as it was the "standard" for Australian early federation "small stamps", I did spot some info on this issue being used in booklets accounting for some other perfs but the "rare" ones are unexplained and I wonder if they have been properly examined in more recent times to confirm without doubt they are not "stretched" perfs. ACSC specifically mentions some and they are only known to exist in a pair. No doubt anyone thinking they have one will need to have extensive testing/certification done. Used singles could be possible to fake.
Anyway the constant flaws can be identified between ourselves with scans of examples, developing flaws too, possibly enough for someone to monograph/catalogue and/or get accepted into ACSC/SG catalogues.
So far though I've been scratching out the varieties of "normal" issues and its difficult to narrow things down to definitive statements to help sorting. It cant even be said ALL Die I issues are a single colour shade because they arent. Colour, Die, watermark are all used across multiple releases, one or two colours are unique to a particular release but since colours are so difficult to be definitive about (ref 1d red KGV issue sorting) I can only try to get all the information into some form that might help sorting this issue. I'm using a spreadsheet so I can add info and move it around easily. I've used a colorimeter to get exact colour values from a colour chart for the released colour shades. It wont match the stamps though as aging/ paper colour/ inking amount etc all vary from stamp to stamp but it could show you one shade is slightly redder than another, or browner, or orange etc which may help along with UV colour to sort colour as the inkcomposition is likely to have changed between printings, so like sorting the KGVs, it may require sorting by year .
Below is a screenshot of how its looking. Again this is just piecing together existing information I'm NOT claiming authorship or ownership or anything really. I just want to put together something that will help me sort my examples and will make it available here for everyone interested.
It would be good to see scans of blocks and strips containing flaws especially if they have selvedges maybe showing the watermarking so possibly in the future flaws can be plated