I often use a wool liner in a pocket diaper under a CPF (and sometimes under a regular doubler). It really forces the doubler or CPF to absorb everything it can. Then the wool begins absorbing the moisture. Eventually the diaper will get wet too, if there's enough pee. But I've found the I have mostly damp diapers when using the liners overnight.
If I'm just laying a doubler in a diaper with a wool liner underneath, I'll often use a regular doubler and a fleece liner so there's not so much moisture right next to my DS's skin. Or I might use two doublers and make sure the top one is fleece-topped.