Hi there! There would be no reason to switch to Gold Standard if things are going well on the Kan versions. Voltrex is like an augmented Benefit Hips and Knees, giving it a bit more power in dealing with osteoarthritis and particularly in paralysis related to IVDD. Lumbrex is very similar to Spine Lithe.
If you're having great results with the Kan products at the doses you like to use, I don't see a need for you to change. As a general rule, concentrated granular extracts like Voltrex and Lumbrex (and all Natural Path products) are more potent than the equivalent number of grams of a Kan tablet. That is because Kan tablets are made from ground dried herbs, not concentrated extracts. The process of making concentrates results in a gram of a granular formula having the same potency as 5 grams of ground dried herbs. Put another way, 5 grams of dried herbs are packed into 1 gram of concentrate. The small powder size of NP and GSH granules actually makes their density closer to a 10:1 extract, but officially they are 5:1. Hence my claim that the Gold Standard products are more potent. They are, but only to the same extent that Natural Path products are likewise more potent, and for the same reason.
Because of the above math, I personally dose Kan products differently, according to the table at https://nphc.ca/using/dosage Using that table, you can see I would give an 8 kg dog 1/8 tsp of granules (about 500g). Each Kan tablet is also 500g, so you'd think that one tablet would suffice, but because the granules contain the same activity as 5 x 500g Kan tablets, the recommended dose is at least two tablets, and could easily be double that.
So, given the above, what would I recommend for you?
If you're having great results, keep doing what you're doing, and don't change. If you aren't quite getting the results you think you should using the dose on the Kan product label, you can safely at least double or triple that label dose to see if you can get a better reaction. If that becomes too costly for your clients, the granular extracts will prove cheaper and perhaps less unwieldy, yet deliver a stronger impact.
Hopefully this answers your question!
Steve