I'm not hot on numbers in the spi as well, so I'll look into this and try to only have numbers in the mainsail.
With regard to F16 insignia, would it really matter if a Taipan or similar raced OD with the F16 lower leech insignia? I can't see that it contravenes ISAF as written.
These OD sailors can be funny folk. It may be politically smart to not enforce such insignia just yet. I will look into this as well.
Wouter