I don't think the lack of using a torque wrench would have warped your rims. Not many people actually use a torque wrench to install the wheels. Most shops just throw the impact to them. I like to finish mine by hand with a socked/ratchet, then drive the car forward and backwards a bit, and then re-tighten them.
You mentioned you mounted your wheels and tires yourself, but did you have them balanced? I usually take my loose wheels and tires to a tire shop and have them mount and balance them for me. Usually they don't charge as much if you bring them in loose and if you take the old tires with you.
Don't get frustrated by the setbacks, use them as a learning experience. Ninety percent of everything I know about cars is related to a prior bad experience and my desire to get things fixed correctly. I know that is easier to say after the fact than in the moment, but we have all been there.
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