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Lots of stuff here:- 1 Maybe you just had a leaky rad cap - 7lbs should be OK. 10lbs or higher may lead to burst radiator core. 2 Not having a thermostat should make your engine cooler - so maybe whoever removed the stat had already had trouble and was trying to keep the engine running cooler. 3 If you overfill the cooling system it will chuck out what it doesn't want - always looks spectacular - fill to the top of the cooling fins you can see with the cap off, and no higher. 4 The radiator core could be partially blocked - try a reverse flush with a hose or remove the rad, and get the core professionally pickled/cleaned. 5 Lack of maintenance or just years of topping up with pond water can cause silt to accumulate in the block, normally at the back end nearest the driver - leading to poor cooling and hot spots. When water reaches these hot spots, it boils, turns into steam, expands, and excess fluid is forced out of the radiator. I got a lot of crud out of my block when I did the head - I used a flattened bit of copper pipe on a shop vac to vacuum out the crud = happy tractor. If you don't want to remove the head, use a fire hose or similar, and flush the block thoroughly. 6 Maybe your water pump impellor is slipping on the shaft - don't worry the shaft won't come out as it is pressed onto the bearing - or maybe the impellor is chipped/broken and not working as well as it should. Check for flow by looking into rad when engine is running - BE CAREFUL of hot water splashes in eyes/face. Some stuff to check, anyway.
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