Regarding the type of grass, it cuts bad on any type. Or should I say, it does not discriminate.
Regarding the height, it cuts bad on most any height. If really tall and thick, then I understand it will not cut well at full speed. I have been mowing for over 40 years and been through many style and brands of mowers. This one just does not work right. I have the deck level and set at 3.5".
Thanks for the comment about Ferris cutting well at full speed. I need to cut at full speed so I can get the job done. Recommendations of mowers that truly do cut good at full speed are most appreciated. I will be shopping for a new 60" zero turn mower right after the first of the year to get ready for spring.