I rather think it is your mowing & not the mower.
When you run over grass with a wheel of any sort the blades get depressed.
That is basically how striping works
It takes a while for the grass to stand back up again.
The amount of time for this to happen varies with the time of day, water content of the grass , the length of the grass , the time of the season and the type of grass and the weight of the wheel .
But if the mower is 2' past the grass when it stands up it ain't going to get cut no matter what mower you are using.
Try mowing slower in the afternoon .
Other than that get an out front mower with a fully suspended deck like the Rider Pro articulated mowers
Engine should be running near max or at max to get the blade speed very high.
Look at the condition of the blades as far as the winglets that lift the grass.
Look under the deck to make sure there's no clogging.
Air for lifting the grass often enters from the top of the deck... is the top clear and clean ?
Install new OEM belts for the blade drive to insure they're not slipping.
Do your blade spindles need greasing ?
How low do you run the deck ?
Purchasing: My money is on Toro or Exmark (same company). Good service and excellent parts backup. But go with a dealer near you, not a "big box" store.
