The clearex is something you use once at the end and do a pre harvest flush, once you settle on a point to start the flush you hit them with the clearex and then from then out only water, or water and sweet or a sugar/carb product.
As far as slowing down or adding more... I dont even know how much you are feeding them, one thing I would not do at this point is feed them veg nutes, the pure blend pro bloom should have more than enough N to carry the plant and they will be fine, your leaves may get a little crinkley or ugly at the end but thats no big deal man, its normal. You cut them off and enjoy the buds underneath where the crusty leaves used to be. As far as hygrozyme, you probably want to stop using that by the end of week 6 in bloom max on an 8-9 week strain so maybe sooner with a 7 week, same goes for any enzymes from any company, your plants will never finish if you dont stop.
You should be worked up to the maximum doses: 25ml pure blend pro bloom, 5ml per gal of hydroplex, these are the ones to be careful with. These will burn your plants silly especially the hydroplex, I havent gone much over the 5ml per gallon with hydro plex, maybe 6ml per gal thats it and as far as the PBP soil I've only went up to 27.5ml per gal, and thats pushing 1800ppm with the rest of my supplements so I dont go much higher with those. You are in the perfect time frame to push your plants, but I suggest doing so with some serious knowing that if you push to hard you'll be very sorry. If you see any kind of burnt tips on the newer growth, thats it your at about the max you want to be, maybe even back off 50-100ppm or a little more.
Good luck and post some pics when you get it worked out.