Bert, are you talking about doing Gflat major scales, well 45 is sufficient, peopel with samller hands HAD tom use 5. I have seen peopel using 5th only acheived at awesome speed just as good as 4 and 5 or yours 3,4,5. By Looking at the natural hand form and structural, that using 5th finger DOES reduce tensions as compared to 4,5. Either will do. I hope this helps..