Hyper Olympic '84 fixing

aka Hyper Sports, from Konami in 1984. Its a great game, but the pcbs are quite unreliable. I had one on the bench today that just looked so close to being working but its turned into a bit of a nightmare. Hyper Sports uses an alternating field setup, after spotting some manky looking signals at several custom pins i set about tracing them. I replaced several chips before i realised that Konami doesn't follow the regular rules of signal flow, ie, inputs at the left, outputs at the right, they often snake signals around to make the symbols fit on the schems. Unfortunately i didn't have my thinking head on, and was perplexed by the signals origin. Only once i was looking at the datasheet for a ttl chip did i realise the node in question was an output, hence the problem was in the opposite direction i was heading! It turned out to be no less than three bad 2114 rams (H8, J8, H9). The sprites were still wonky, 4bits bunched up at the left side of the screen but active, the other 4 bits spread all over the screen and static. A bad 74ls163 counter fixed the bunching at the side of the screen, but i can't track down the lack of proper movement on the other 4 bits. I can 'see' the CS of the SRAM isn't right, looks like a clock problem, but my head hurts and i need a rest before i tackle it further. I had sat down to do what i thought was a quick fix, nine chips later and its still not sorted :(