I would recommend keeping that conical cooler. If you're measuring with a thermowell, you're probably keeping it around 70 in the middle of the conical, cooler near the walls, but 64 is ideal temp for most ale yeasts, 70 is a bit high on its own, and when you start an ale at 70, it's hard to keep it from getting out of hand in the first couple days of heavy fermentation.
If I may ask, how much did your system cost? I'm looking at doing some nano-scale brewing here, and while US prices and equipment will be different from what's available in China, another data point would be good.