Do you think I have over done it on these replacement resistors?

[mendip_discovery]

These are the 2 Ω and 0.5 Ω continuity resistors for a Multifunction Tester calibration test box (Transmille 2080) but I thought I would replace it with lower tolerance from 5% to 1% and up it on the Wattage considering my workmates managed to blow the old ones. It is easy to do, they share a common with the 1 MΩ, 10 MΩ and 99 MΩ insulation test resistors.

[shakalnokturn]

Nah, they're still on the small side...
As long as you have enough clearance to shut the box and not risk having a resistor melt its way out it should do the job.
Now that the resistor is no longer the weak point you may want to reconsider fusing just in case.

[mendip_discovery]

If you look at the circuit, it is tagged onto the side of the in for the 2 and onto the pad for the COM so not much room for fuses.

If you look at the surface mounted resistors they are for 1, 10 and 99M and take the 1kV loads.

[perieanuo]

(Attachment Link)
These are the 2 Ω and 0.5 Ω continuity resistors for a Multifunction Tester calibration test box (Transmille 2080) but I thought I would replace it with lower tolerance from 5% to 1% and up it on the Wattage considering my workmates managed to blow the old ones. It is easy to do, they share a common with the 1 MΩ, 10 MΩ and 99 MΩ insulation test resistors.

upgrading the power in your case serve no logic, maybe you will move the problem in a place not so easy to repair next time your workmate repeats the bad move
the tolerance, that's same thing, i'd guess you will recalibrate after replacing the resistors anyway and without putting on paper the whole schematics we can't estimate if replacing part of divider with higher precision will improve greatly the precision
 you can easily stick to the originals, maybe the power was calculated for those resistors to fail and not the ucontroller after them

[factory]

I agree it's a bad idea to replace a sacrificial element such as the low power resistor with a bigger wire-wound one, instead of failing in a controlled manner with an open resistor it may cause damage elsewhere, worst case you could end up with a very burnt PCB, which would be more costly to replace.

The comment about adding fuses, remember that fuses have resistance and it may not be possible to adjust the circuit to compensate for this.

David