Oh, if the injectors are rated at 45psi then don't run them at 58psi or they'll explode.
Seriously.... the injector's 'rating' is actually a fuel flow rating and they specify the fuel pressure used to obtain that rated flow. You can run a fuel pressure higher than what they use for rating the injector... it just means that the flow rate will be higher than the rated flow rate.
Testing the spark wire resistances doesn't cost a whole lot of money... but it doesn't matter now, you seem to have found the problem.