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I have a 97 civic dx hatch that overheats when driving but not at idle. Found a leak in one of the lines, replaced it and looked for other leaks and didn't find any. But the engine still overheats so I replaced the thermostat thinking it might not be opening right. When I tested the thermostat it was opening until around 30°c of what it should, so I replaced it, but the engine still overheats. Any ideas? I refilled the system each time with a 50/50 mix so it's not low on coolant.

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I had a Civic once.
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Make sure to properly bleed the coolant system. Leaving any trapped air in the system can cause the symptoms you're describing.