IMHO non-autoconfig RAM is not that good idea, all system structures allocated during boot will still be allocated from chip ram instead of fast ram. I guess problem is CDTV DMAC autoconfig which gets blocked by the board. (Can be confirmed by checking if showconfig or artm or any other system utility show CDTV autoconfig "board" at E90000) or it does not support DMA which CD data transfer use. (Expensive/rare) 8M Elbox RAM board works.
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The mini megachip 2mb upgrade is rarer than a sober Gascoigne, so I had thought about "piggy backing" the chip ram ala A500 mod but, I'm not sure where to get the 2 signals from or if it would work at all.
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You need 2M PAL Agnus which seems to be as rare as PAL megachip. CDTV comes with 1M Agnus.