Ohm tap

I just got myself a pair of mono tube amps (sonic frontier power3)and connected to a martin logan sequel II. Since the connection for changing different impedence load is very difficult (more than 30 screws each) I need a guide to experiment with- 2 ohm, 4 ohm, 8ohm. what effect each of these set up will bring. The rest of my system are: Teac vrds10, PS Audio ultra link II with HDCD, sonic frontier SFL2. Thanks. Harry