Secret Project : while this card is ready all cards get + 1 difficulty
Kula R Destroy a Foundation: Before making a control check that check gets plus X. X equals the difficulty of the destroyed foundation.

If i destroy a printed 2 difficulty foundation for Kula's R, and I have 2 secret projects out does it effectively become a +4 to my check?

Yep, exactly so. +X difficulty applies to all cards in play, or to cards that are being attempted to be played.

Stamp for MegaGeese.