Dear Zargon,
By all means, use a range of force up to 2.2 grams if necessary. The 1.8 is the "standard" setting recommended by Immutable, the manufacurer of the generator we use (we make the cartridge body and supply the 4-N silver wire ourselves)... We have found it works very well at a 2.0+ setting, and with no problems with buzzing or increased wear. As I mentioned in my post, tracking a bit (but within a reasonable range, of course) heavier is actually kinder to your records than the psychologically-tempting lighter forces which may result in poor stylus contact and groove rattling (chiseling...!)