That spring shouldn't have any effect on your tranny popping out of gear.
You can try Redline MT-90 it's the best performing choice for our Hyundais. I doubt that'll help with the tranny popping out of gear but you'll have the best fluid available in the tranny then.
Aside from that you can get under the hood and put the car in 5th and see if it appears to pull it all the way into gear.
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