The WO FF 0.8 distance is ~55mm. As the Canon EF mount is 44mm to sensor, that leaves 11mm for the t-ring to take up. The t-rings I have measured have been around 11mm, so it should be very close, unless you are doing something differently.
From the reading I have been doing on reducers lately, the image you posted is undercorrected. You could try tweaking the distance, but the smallest t-adapter spacers I have found are 7.5mm. Look for the Baader T2 7.5mm and 15mm spacers, I bought mine at OPT but there may be a domestic source.
The WO Flattener v2 and v3 are supposed to be targeted at differing focal lengths/apertures of scopes, so if you have the 2 you might want to try out the 3, or vice versa.
Regards,
Eric
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