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I'm not sure how you would calculate the CURRENT rating of a fuse that you could add to the 7.5 ohm resistor. About 0.8 A would produce 5 W in a 7.5 ohm resistor. But the fuse isn't meant to protect the resistor!
Sounds like either something is draining off the charge or the voltage isn't as high as it was or its you imagination. If whatever you are discharging with has a higher resistance, it won't pop or spark as much. It is actually better for the capacitors not to use a dead short, less of a current surge.
Do be careful of measuring the higher voltages. If your meter is only rated to 600 V, the probes may not be safe to hold above that.
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