I suppose it's possible, but I know of no simple way to do it. Every one I've ever handled is noticeably looser on one side than the other.
If you've ever taken the P89 apart, you'll find that only one of the safety levers is really operating the internals, the lever on the other side is a loose fit and all it does is actuate the main lever.
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Also, I have read that it is worth it to upgrade the recoil spring and the hammer spring. If I do, should I go heavier or lighter with the springs?
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I'd leave the recoil spring and hammer spring alone. If you want to do something relatively simple that will make a noticeable improvement with very little chance of negative repercussions, replace the original trigger with a factory trigger from a Ruger P95. It can require some fitting, but usually it's a drop-in. The different trigger shape gives the shooter more leverage, a shorter trigger reach and less overtravel. It makes the gun a lot more shootable.
Here's a picture of a P89 with a P95 trigger.
