In the current batch of aristo #6, the only thing that seems to be bad is the frog, the gap at the toe of the frog is too big.
In the previous generations, the flangeway width (on the stock rails) is too wide.
Are these the only switches you have? If so, check the gauge of your rolling stock, especially the back to back. These switches are usually pretty easy to get through.
I have seen tight check gauge too, but knowing exactly what is happening to your loco. Is the switch "hanging up" does this mean the switch is not throwing all the way?
You can make these switches work fine.
Regards, Greg