I hope you don't take this the wrong way, but the only way to remedy the issue with razor burn is improving your technique. You are, most likely, using a bit too much pressure in those areas and if you would ease up on the pressure and, probably, do one less pass or a different directional pass, you would see some improved results.
If, however, you would still want to experiment with aggressive razors, there is a plethora of them.
* Muhle R41
* Ikon Tech
* Blackbird
* Timeless .95
* Progressive on setting 5+
* Parker Variant on setting 5
etc.
Good luck.