3300 feet altitude question

Question: if I’m from Houston (humid, no elevation), and I play somewhere that is at 3300 feet of elevation and dry, how much should I need to increase the tension of my strings to compensate? I’m currently in my last 2 months in a university town before I move back home, and my level of play here relative to back in Houston is astonishingly different. I can hang with 5.0s in Houston and have no trouble keeping the ball in play, whereas in my university town I play at a 4.0, the ball flies long no matter what I do, and I lose all confidence in my strokes. I have no issues sailing the ball using my XTC 305 at 52/55 w/ Red Code and a syn gut in Houston, whereas I feel like I need to go 10lbs higher in my university town. If I hit the same shot in each location, all things equal, the ball goes at least 5 feet farther in my university town.


I would be surprised that 3300ft altitude would affect anyone at our level and have effect on string tension.
However, humidity does. Could be that in Houston balls are heavier (wetter) and therefore do not fly out as much as in drier environment?


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It's an air pressure thing (mostly). There's lower air pressure (less resistance) in your university town than in Houston. I experience the same thing whenever I visit my folks in Denver. I currently live in Atlanta but I'm from New Orleans. If I'm not using high altitude balls, I'll up my tension by about 2 to 3 pounds. If I'm using high altitude balls, then I stay with my normal tension.
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As you have noticed the balls feel a little livelier and travels through the air more efficiently. If you don't have arm issues, going 2-3lbs up is a good idea, or even close the gap between mains and crosses so your launch angle is lower. You may also want to go to a thicker string to control the power if the tension rise doesn't tame your strokes.