why are your months only 3 weeks long?

or why are your rest weeks giving you absolutely no tss?

imo, you're thinking about this far too much. if you can't do 3 800tss weeks than do 3 700tss weeks or 3 600tss weeks or whatever you can do. IIRC, zecanon (one of the most successful guys on bf) said that his training improved greatly when he stopped chasing tss points.