I think the question about the level is pretty spot on. As an example, I was about 1300 after the 2019 US Open (after playing for 9 months) and I am not seeing an advantage right now going to carbon. As the EJ in my name says I have more than one blade and I did play a Clipper equivalent (Yinhe PD 437) with H3Neo and Yinhe Pluto SP. This setup played really nicely but also not much different from the Fextra/Nittaku combination or from the Yasaka Ma Lin Carbon/Rakza PO/Rakza 7 Soft combination. I conclude that when staying at the table *and* also playing strong top spin on one side and SP on the other side it's better to err on the side of top spin blade (SP works fine with it) as opposed to using a harder blade (where top spin becomes much more difficult unless your technique is already very good).
So in the USA 1000-1500 range I see no point using a fast carbon blade until the technique is really good or you have a coach who tells you to use one.
I do want to say I am currently leaning to conventional short pips (Moristo SP) as opposed to "spinpips" (Rakza PO, Moristo SP AX, TSP SpinPips) precisely because blocking strong top spin is easier with the more conventional short pips.