Hi folks, two friends of mine want to replace their 11.8 and 8.4 Airblasts. One of them is 80, the other 85kg. The one with 85 was happy with the range the ABs provided, and would like something similar. Which combo do you recommend? 17-11 or 17-13 or 15-11? The other one uses an AB 6.3 as the small...