I run the Avon Speedmaster & SF Mk II on my G5. First I didn´t folow the manual that says 18/28 psi front/rear but instead pumped in 27/35 psi. The bike felt more stable then, unfortunately the front tire didn´t come even close to the temperature of the rear one, even when pushed hard.
I also recognized a very uneven wear pattern: the tire´s center was run down, whereas on the flanks there was plenty of rubber left. Due to the higher pressure the middle part was pushed out too much.
After I changed the front tire I finally could remove the wobblieness in the front that I felt with the stock recommendation of 18 psi by tuning the fork. With progressive springs it feels more transparent now and works fine with 18-20 psi in the front tire which now is able to get more temperature and more adhesion. Breaking improved aswell.
So try out different pressures and watch the temerature you can get in comparision to the rear tire. The SF Mk II on the rear works average almost irrespective of pressure. The front, however, is more complicated. If you don´t get a good result consider changing the fork oil or even the springs.