Try swapping your two RL70C's. We had the same problem on our previous boat and "solved" the problem with a swap. Of course, RL70C's are hopelessly obsolete now, so this may be a good time for an upgrade.
To answer your question about VHF. We like the Standard Horizon GX 2200 which has a built in AIS receiver. The display on the radio is small, but it will output AIS data to most chart plotters, just not your RL 70C. There is a GX 6500 in the works which has a built in AIS transceiver, but as far as I know, it is not available in the US yet. Go to Panbo.com for everything you wanted to know about marine electronics.
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