Could this possibly be a side-effect of Russia's falling behind China in terms of next-gen R&D and systems integration? As POP3 reveals, the 055 in its current form is an
extraordinarily optimised version of an original design that weighed over 20,000 tonnes, achieved due to a design emphasis on universality of systems (e.g. modular VLS, good systems integration).
If the Russians, in their cash-strapped state, can't afford to find/train/hire a large cohort of engineers to integrate systems and conduct R&D into next-gen systems, or can't afford to do so extensively, it's plausible that the Lider class is as heavy as it is because of inefficiencies.
That's the case for the USN but I'm not sure if it is for the PLAN. POP3 has a thread
where he explains various aspects of the PLAN's philosophy regarding C&C and the ships responsible for hosting them.
The PLAN differentiates between small and large command vessels. The small command vessels simply coordinate conventional surface actions. Every single new-built PLAN vessel has small-command capability by default including even the older Type 052, small Type 054 and Type 056. The large command vessels are fewer in number but pretty much every flotilla in the PLAN has such a ship. The large command vessels are capable of coordinating air, ground, surface, sub-surface, and space assets. The first such vessel is the Type 051 DDG-134 'Zunyi', which is still in service. To POP3, the fact that DDG-134 is still in service illustrates an insufficient number of large command vessels. However, the fact that every flotilla has a large command vessel already far exceeds PLAN expectations, which they laid down a decade ago. He predicts that the PLAN is about to double their aspirations to equip every flotilla with
two large command vessels instead of the current one. But I digress...
You believe the PLAN doesn't need that many Type 055s because, to you, it is a cruiser and represents primarily increased C&C function over the Type 052D/E. But we have POP3 saying even a Type 051, that antiquated hulk, is capable of serving as a large command vessel. Additionally, DDG-112 is supposedly far superior to the DDG-113 in C&C capabilities even though they're both classed as Type 052s.
Therefore, I don't believe the Type 055 offers primarily better C&C capabilities over the Type 052D/D; that should not be a factor in your estimate of their eventual numbers. If the PLAN wanted another large command vessel, they could simply modify a Type 052D/E instead of building more Type 055s, like they modified the DDG-134 and DDG-112.
Of course, you could still make the case that the PLAN will procure the Type 055 in much smaller numbers than the Type 052D/E, but you'll need a different rationale.