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Ah I see, you're running the pump full speed most of the time.
Slowing the pump should increase warmup time. In the computer watercooling scene, it was well known that higher flow always increased heat transfer rate, but going with a higher powered pump would cause the water to heat up more and would start to increase your average temperatures. Since an engine block has rather long coolant passages, perhaps it would be more useful to note that in particular, radiators benefit from greater coolant flow rates.
If your block is at some effective average temperature, higher flow makes the temperature of the water more consistent. The heat transfer rate (local) is proportional to the temperature difference. If you have hotter water on one side, colder at another area, same average temperature, the water is absorbing more heat at the cold area, but it's also absorbing less heat at the hot area.
If anything, having the pump dump some extra energy into the water would decrease warmup time, and greater flow would increase the cooling of the block, and extract a greater amount of heat per unit time, which is what matters.
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