Been on Canna for about 2 years now, but Tera- not the 2 part line. I've not tried what you suggest. PK 13/14 is a tric enhancer, boost is a flower bulker. Boosts NPK numbers are low, part B high. And I know why you want that to be true, 500 bucks for a 5 L supply, and any smaller quantity doesn't make sense. Amazon sends it do my door for $348. I'd suggest you keep to recommended nute mix from CANNA, and the pretty dutch girl in the hoodie on my feed chart rocks, check her out every feeding. IF i was going to replace Boost, id look for a knock off or recipe. IMHO this line has increased my yield and quality to not deviate. I do other things on water nights, Mammoth P, Sweet and SnowStorm Ultra (with a long flush at finish), OrganaBasic and White Shark to the soil. I know you asked for those who have tried it but that's my 2cents
Woody