You've more than likely shorted out an old ass, brittle wire somewhere, or something was unplugged. The proper thing to do would have been to repair the old wires and cover them with split loom.
Yes, the springs are stiffer, that's the whole point ;). You shouldn't have to worry about the valve train or friction when you shim it after putting these in and you are using proper oil for your engine and running on a healthy, relatively free flowing oil system.
A Valve job is always...
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