I’m interested, you are saying the soft version holds tension longer?
No, I said it takes longer than HyperG before it goes dead. For me, all poly strings go dead (lose their resilience) and feel harsh well before they lose enough tension to have erratic control. So, even when I’ve played with fullbed poly, I have to cut them out and restring well before the control gets erratic because they start feeling harsh and uncomfortable earlier. With ALU Power, it happens in 7-8 hours, HyperG in 12-15 hours and HyperG Soft after 20 hours. In a gut hybrid, I break the gut within 20 hours typically and so, I have to restring because of that. So, I have no idea when the tension drop becomes a problem for any of these polys.
If you are not a string breaker and want comfort with good performance, fullbed gut at 20-25% higher tension than fullbed poly is usually the best bet as it will play good and retain tension well beyond 50 hours. Multifilaments will lose too much tension in half that time. The only problem with full bed gut compared to a gut/poly hybrid is the reduced spin which in turn leads to reduced control and lesser ability to hit sharp angles and less spin on serves. I hit with more power with gut/poly hybrids than with full bed gut (which I used for many years) because I can swing out much more freely and harder when the poly crosses are there to give more spin and control. This may not be an issue at levels below 4.5 where the swing speed is not as high and full bed gut at tensions above 57-58 lbs can still provide good enough control.