Here's some of my tips
1. If you find you can't keep boosting outside the nappy in place, consider a two nappy system - a smaller trimmer nappy first, then the boosting and then a bigger sized nappy. This also allows you to get HEAPS of boosting in if you have a heavy wetter at night or a tummy sleeper.
2. Another system that works well for us is a two soaker system, where I have the option to boost in the middle of the two soakers. The first soaker isn't lanolised. Wool can hold 30-40% of its weight in moisture. The outside soaker is lanolised. I currently use two soakers at night with my "big" little man (11weeks) with a boosted BBB and extra boosting. Previously I have used this system with my big man (21 months) with the extra boosting in the middle of the soakers and had great sucess.