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Now I start to wonder that how this is possible because I don't believe that cluster munition is more powerful munition than 155 HE?
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Yes, it is, if you consider that anti-vehicle submunitions are shaped charges and therefore penetrate more armor than blunt PIBD HE shells.
Also they have more chances of hitting a tank because of the sheer number of submunitions per shell. I know that arty shells can be placed quite accurately in good conditions, but in game terms, you still have one shell in 2500mē (one hex), while the same one round can contain 50-60 bomblets (from the top of my head), that gives 50mē per bomblet.
Given the average top-view surface of a tank is roughly 3x7m so 20mē, you have about 2 chances in 5 that a tank will take a top hit that will penetrate its roof armor. And as I wrote previously, a "kill" in game terms is a very loose definition, say a weapons and motor kill or the crew being knocked unconscious is a kill.
So with a good margin, you have one chance in 3 that a DPICM round will "kill" a tank if it hits the right hex. Now I have no idea how much surface a 155mm cluster round will cover, but I have heard that they are designed to endure a spread pattern of at least 1 bomblet per tank-equivalent surface.
Much headache for not much result, I know
