hello Smudge ...

It may be easier if you wait until the off-season to drop your carbs. For most people, energy levels drop way off during low-carb diets (yes, even on a CKD ...) This may not be the most beneficial for you or your team during your competitive season ... and rugby is a VERY high intensity sport.

You can try a CKD, but if you have competitions later in the week (Wed, Thurs) your performance may suffer.

If your competitions are generally Sat, Sun, Mon, Tues you may be OK. MAYBE ...

It's your choice, but when I am in-season, I keep my carbs up so I perform at maximum. Use your off-season to achieve any new goals that you have to prepare yourself for your NEXT competitive season.

That's my advice anyway.