Balsa Carbon is a type of blade that got warned a lot from construction view point. Balsa is light yet very springy. Carbon widens the sweetspot and to certain extent (depending the type of carbons) is springy as well. So it is like adding 2 materials which have similar characteristic, thus it will be extreme (instead of complimentary to each other).
As Manto has stated above, Clipper (being a 7-ply blade) is closer to your current blade compared to Korbel.
You want to know the differences between the two?
Clipper = limba - ayous - ayous - ayous - ayous - ayous - limba. Thickness is supposed to be around 6.8 - 7.0 mm. I have several Clipper Wood and one Clipper CR. Thickness varies from 6.6 - 6.8 mm (based on my measurement).
It is rather stiff and felt medium soft (for Clipper Wood) and medium hard (for Clipper CR). Clipper CR is basically a Clipper Wood with varnish. You can just buy Clipper Wood and apply two to three coats of varnish to replicate a Clipper CR. Being a 7-ply allwood blade, it is excellent for hitting and blocking, and yet it is still good for looping, given that you have a good technique.
Now regarding speed, it depends on the weight. I remember at one time owning a 97 grams Clipper Wood (sold already), while at the same time I have 93 and 90 grams Clipper Woods and 84 grams Clipper Wood and 84 grams Clipper CR. Of course, 97 grams Clipper Wood is faster than 84 grams Clipper CR.
About Korbel:
Its construction is limba - limba - ayous - limba - limba with thickness of 5.9 mm (I measured all my Korbel). This is what amazes me as thickness of all my Korbel blades are within +/- 0.1 mm of its specs. Weight is different story though. I have 93 grams Korbel as well as 84 grams Korbel. Oh, one more thing, I have the Japanese version. You can also get European Korbel, which is usually lighter and a bit more flexible.
Now, this is the jack of all trades. It is the medium of medium. It can push, loop, block, smash, etc., you name it, Korbel will be good BUT not excellent. You want a better looping blade? Yes, there are many which are better than Korbel. You want a better smashing/blocking blade? Yes, there are many which are better. But the point is Korbel gives you everything you want (but does not excel at any aspects). Even you can use Korbel for defensive play (as what Gionis does).
So for a blade that can do everything well (but not excellent), Korbel is the one. So if you are not sure what blade to get, Korbel is a safe choice.
Now a WARNING:
Given that you use Balsa Carbo X5, you will have a harder time adjusting to Korbel (compared to Clipper). But if you want to improve (the first 3 months, you will see that your level of playing decreases as you adapt to new blade), Korbel is a good blade. So is Clipper.
We can only tell from our experiences which are different from yours. They are not expensive blades, buy them and sell the one you don't like. Or better yet, borrow from your friends, and then you can find out which one is better for you.
