I was appalled by the idea that God allowed some to suffer more than others, to help bring them into a deeper knowledge of Himself. But then I look at those who suffer - and often they are the most faithful, trusting, loving of all God's children. Truly, they are chosen vessels. I know some will be offended by what I've just said. And that is because we have strayed so far from the realities of Christ's Gospel.
Perfect love casts out all fear.
Not perfect faith - but perfect love. Perfect love is the rest God has for His people. He wants us to rest in His love, trusting that He will always come to our aid as a father to a hurting child in spite of our inadequate faith. Stop evaluating or grading your faith. Quite trying to figure out faith.