golf: two swing plane?

[Rico]

im a fairly inflexible guy can barely turn my shoulders to my right foot, jst all round tight. i was wondering if having a one swing plane is that important , i 've always tried to correct my two swing plane (over the top,sorta like fred couples, john daly), but my body inhibits my from doing so and i end up hitting bad shots but if i use my old two swing plane i can hit fairly descent shots. im in a real dilemma whether to keep trying to change my swing to a conventional one swing plane or jst stick with my two swing plane, it's getting to me because i never can get good practice on the range since im always changing my swing so i want to stick with one. thanks