Even though the Maximum Working Pressure is listed as 50 psi, it’s not a good idea to run anywhere near that pressure. System components are more likely to leak or fail prematurely.
Also, 50 psi does not tell the whole story. What matters to the integrity of the grids is the pressure differential between the input to the filter and the output of the filter. For example, if a system were 70 feet below a pool, it would add 30 psi to the system, but it would not add any stress to the grids, because the pressure on both sides of the fabric is increased by 30 psi.
In other words, it matters if the pressure is created by the grids or by something after the filter.
At about a sustained 30 psi differential, the grids will begin to collapse and you will get tears at the spot you show because that spot does not have good support.
The Whisperflo is a high head pump and can get up to almost 39 psi. It can definitely damage grids if the pressure is caused by dirty grids.
It would be better to reduce the power of the pump, if possible/practical. If not practical, then keeping the grids very clean would help reduce damage.