Candyflipping is amazing indeed, but I wouldn't recommend that you do it at a rave for a number of reasons...
Having done acid twice is really not much experience at all and it takes a while to even become familiar with going through the ups and downs and the challenges of an acid trip while in a safe and controllable setting like at home with a guide, let alone an uncontrollable setting like a rave.
I just don't want visuals to be too crazy and then I won't be comfortable talking to people. The last times I took acid everyone looked like ogres and I didn't feel too comfortable looking at them unless they were on acid too.
All of this would certainly be a potential issue with candyflipping. My experience is that it is easy to get unhinged from reality while candyflipping a bit like the reality spin-off hallucinations people describe with MDA and like I have gotten on high dose MDMA (which produces MDA in your body as a metabolite). Yeah it be funny and fantasy / imagination / dream like but it is highly impractical if you want to reasonably and comfortably talk to other people.
Yes MDMA helps with easily talking to other people but the LSD can quickly get a bit disturbing especially since they synergize (potentiate each other).
I would definitely recommend trying a canfyflip at some point but do it during an occasion when you can be supported and guided and are basically close to safety like your home. Having a bit of a party at your own place with close friend who are not strangers to imbibing similar things would be an example of a good occasion, most of all if you have the possibility to retreat when you need a moment to yourself.
Also I agree that being certain about the identity of the drugs is pretty much a must so basically lab test or having sampled the very same batch yourself at a previous time. Candyflipping is wild and unpredictable enough, rather than some juiced up version of it.
Sure a source would consider the results proof that he has potent stuff, and he may very well have the best intentions at heart... but "loving the lights" is a bit simplistic.
First get a bunch more experience with LSD, then try a low dose of LSD on its own at a party that is not too massive or hectic or overstimulating and/or experiment with a candyflip at a party at someone's home before continuing with serious combo's at raves or festivals.
Best of luck and be safe!! Consider all the wonderful options you still do have :D