The 45 is definitely shorter the the stock pair. The 45's should be fine especially if you don't go up to the top holes.
You're probably right, the 54's would probably be long even for balling.
Placed order for Mambacolor less than an hour after they dropped. Original delivery date was 12/4, then 12/7. Now it's 12/9 after being stuck in Chek Lap Kok for 2 full days! 128545