That IS a great mowing machine, none better...
But you will Not be able to get the type of cut you want, or that it was designed to do, If you are going much above 1 inch...
As to sharpening, take a close look at the rotating blades, if they are showing any rounding, especially the leading edge, you will have to grind them true, lathe works best. Once all are true, they will self sharpen, you can use valve grinding compound to lapp them in, it will help speed the process, just be sure the bed knife is true, and watch the leading edge of the blades...
....being as how your only mowing about a half acre, You should have no problems keeping it sharp for 10 years or so, before you need to true on a lathe again...
There is not much you can do about the speed... those mowers were designed to cover a Lot of ground FAST...
If you read from the Start of this thread you would be familiar with "Lizard" He was one of the early members to these forums, one of Your countrymen... And a very knowledgeable fellow, especially about your mower & the type of greens you are after... (Sure do miss that guy)... This particular thread was started by him along with several other Interesting ones..... :smile:KennyV