in sparring i normally flow from left lead and then switch to right when i'm hammering people. when i'm infighting (knees, elbows, head etc) i'm normally front on but with my weight on the left.

in answering your countering question... its your body reacting how it reacts. work with it rather than again it. you'll find it working how it needs to if you stop thinking about it.

sparring point of view of course.

its the line work that'll screw you every time!