Cannabis in containers (really pretty much everything) really doesn't need a lot of P. About 1/3rd the amount of N required in fact. There's times when using a booster produces beneficial results but the idea of starving a plant of it's most important nutrient for an extended period never made sense to me. As long as you have a balanced amount of N and K you're fine. The only way veg nutes will inhibit flowering is if they're really high in N and low in K, like 3-1-1. I know a few people who are running Dyna Gro's Foliage Pro and Protekt straight through and that combo should come out somewhere between like 3-1-2.5 or 3-1-3 depending on how much Protekt is used and it does a great job. I've been running Jack's 20/20/20 straight through because I'm broke and it does just fine. I just get asked how I keep all the leaves on my plants so healthy!