You should forgo the PK 13/14 and the Boost Accelerator and instead purchase the Rhizotonic and the Cannazym.
PK 13/14 is little more than Potassium Phosphate. It is the only ingredient listed on the bottle. If you'd like a good bloom booster take a look into KoolBloom. It contains the Potassium Phosphate, as well as Magnesium Phosphate, and others. The diversity of pk sources, including necessary elements like magnesium, is a good idea.
The Boost Accelerator is okay enough stuff but I would consider it extra and not really needed. Works GREAT as a foliar spray if you wanted to get the 250ml bottle and save some money by using a hell of a lot less of the stuff. Resin production is increased, but not dramatically. I'd have to think that a combination of Bud Candy and Snow Storm would have better results for a lower price.
The Rhizotonic is worth EVERY penny. A healthy root system supports a healthy plant. The bigger your roots the more they can uptake and the larger and happier your plant will be. You want to grow big buds? Start with the roots. They are the foundation of your skyscrapers.
Canna Coco A+B runs low on Phosphorus for bloom. Boost Accelerator contains only trace amounts of elements and you'd be dropping (literally) $5 in nutrients every time. The CannaZym at 0-2-1 is specifically formulated to complete the system, and designed to be run in flowering at around 10ml per gallon or so to balance the NPK ratios and to keep the root zone healthy. This simple fact makes CannaZym more like Canna Coco C. So you have A and B, you need to get at least C to complete the system enough to use it.
So that's my input. I've used everything Canna has to offer. The Boost is too pricey, the PK 13/14 too expensive for what it is, the Rhizotonic is like gold in a bottle and worth every penny, and the Cannazym is an indispensable part of the Canna system (if you do not include a different high phosphorus supplement).