no your measurements are not odd at all..a 6 inch girth,in my opinion is the bees knees..its a great size...
now if you are going to focus on length i would suggest you first start to hold your stretches for longer,work up to 30 seconds each stretch and then finally hold for 60 seconds...thats if its not too much for you cos if it is then you should wait until you are ready..
If its really length you want then you could easily do these exercises 5 or 6 days a week but allow for some rest days for growth and recovery...but i have noticed myself that when you set out to work on length you will have to sacrifice erection quality a little...your erections might not be as strong for a while but as soon as you return to girth work or other exercises you will get your best wood again with your extra length,thats if you worked hard enough to make gains..you can achieve an inch in length easily especially if you have patience and dont try to hurry things,then you can enjoy it...there are also some other stretches you should have a look at on this site...