1300 its very beginning level? Then they might improve a bit. In general I see in my club many people 50+ and 60+ who practice almost every day and don't have any improving. In this age you just don't have speed and reaction required for playing on higher level
I had same problem with pop up balls with P1V. This problem solved by changing to 1.0 thickness. also with my current rubber 388D I have much less pop up balls then it was with P1V even my 388D also 0.5