I think that I push my Cafe bike pretty hard occasionally. On the Dragon on the last visit I was braking hard enough to feel the bike getting a bit "wiggly" under very hard braking. I may not be pushing it as hard as you do in the corners....I still have about 1/4" of chicken strips on the edges of the tires (I like to keep just a bit of a safety margin in case there is something around the corner I don't know about). My engine has a 95mm Wiseco, Stage 1 cam, ported head, Mikuni VM carb, and a good exhaust system....it is noticeably faster than a stock bike.
So far I have only used Pirelli Sport Demon or Bridgestone Battlax BT45 tires - which are the stickiest rubber I can find. I don't like the tire size that RYCA puts on the bikes - I feel the 100/90 front is too tall of a tire, and jamming a 130/70 rear tire on a 2.50 rim is wrong. My front tire is a 90/90-18 on a 2.15" wide rim, and on the rear I am currently using a 110/80-18 tire on the 2.50 rim......or a 130/70-18 tire on a 3.50" rim. When I wear out the current 110/80 tire I will be replacing it with a 120/80-18.....and I believe the 90/90 front and 120/80 rear is the "correct" size for the RYCA. I also have a fork brace. And.....I have ShawnRYCA's big brake kit on the front. The bike brake kit is a "must have" if you are going to be pushing the bike hard.
To make my seat more comfortable I had a local upholstery shop make me a new seat that has padding on the edges. I also modified the clip on bars to have an angle in them - so the bars have less of a downward angle and it is far easier on my wrists. (I bought steel tubing and cut them at an angle and welded them back together with a 4 degree angle).
Below is the discussion thread on the Cafe tire size. I would suggest you try a shorter profile front tire if you have an 18" front wheel - if you still have the stock 19" front tire your selection may be a bit limited (Avon Roadrider appears to be the only 90/90-19 available). If you have the 18" front rim try the Pirelli Sport Demons if you want the best grip, the BT45 if you want good grip and a bit better mileage...and the Avon RoadRider might also be a good choice.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1435340395 
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