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Imho high velocity and dehumidifying are two words not to be used together. I dont have any experience with unico type systems or any newer residential systems (i work comercial)but what is your cfm/ton of cooling? And where are you located? Bringing in outside air with an erv has to be designed very carefully and in very humid climates is almost always a nightmare. You have a very inefficient and from what it sounds like ineffective system designed here. Wondering why this is the route you or someone else chose for your home. Im many areas of the country reheat is no longer even allowed to be designed into new installs with few exceptions but none of them being residential. You need to be careful playing around with your chiller. Make and model of chiller would be helpful. You cant run the water temps down that low safely without a glycol mix. And there's no need for chilled water below 42f in any building for comfort cooling. Your water flow is too high rite now, how is the flow controlled? Dp? Your chiller must be cycling alot which is not good for it. You should have return water in the mid 50s for most conditions. As your return wtr temp drops below that your chillers efficiency reduces as well,and quite a bit too. You already have one of the most inefficient residential setups I've ever heard about, why not try to get it all running correctly? What I would do is focus more on keeping humidity out of the building rather than trying to remove humidity once its entered. It's a house, not a school or office building where the setup you have is common due to ventilation requirements. Why not just run the fresh air intake only when its needed, have it interlocked with exhaust fans and dryer. Pretty easy to do with a relay and a few ct's you should be able to run 42-44f supply water sp. With no reheat needed if everything was designed and sized correctly.