You may want to use a gear-inch calculator to check your cassette with different chainring combinations. When I did this with an 11-32, 9 speed cassette, I found that with 22-32-44 tooth chainrings there were several cases where the gearing on the middle and larger chainring were the same or very similar. If I changed the middle ring to a 36 tooth I ended up with a more uniform distribution of gears and the shifting pattern was better. At the high end of the gearing the steps would shift between the larger and middle ring with a single or double shift on the cassette. The smaller chainring basically stood alone and gave me 4 or 5 low gears. Taking a quick look at your set up it looks like you have a similar situation. I would look at changing your 48 tooth ring for a 44 as well as getting a smaller inner ring and see what the gearing looks like.