When you say you 'don't think' you can get 6/9 out of your left eye how certain of this are you? Since the RE does not exceed +5D then 6/9 is the limit you need to get to. It is worth spending the time and effort with an opthalmologist to determine the best you can expect to achieve. If your acuity is neurologically limited then the best acuity can be quickly determined. Best to be absolutely certain about the best acuity to you could possibly get before exploring next ptions.