So you studied successful formulas.
Maybe not in this post, but you consistently challenge statements of God's faithfulness in doing beyond what we can accomplish without him. If you are really searching for answers, I'm missing it. It seems like your goal is to discourage. I'm not intending to flame. I'm giving an opportunity to clear up a possible misunderstanding.
I don't think that it is God's faithfulness is the issue. God is righteous in all He does, and He has definitely promised that the spiritual gifts are for the Church, from the Day of Pentecost right through the Church Age until Jesus comes again. This means that because we are still in the Church Age, the gifts, including the gifts of healing, are available to the Church.
I am not saying that we should give up praying for the sick, because the Scripture says that we should always pray and not to faint (give up). Also the Scripture says that God's eye is upon the righteous and His ears are open to their prayers. Philippians 4:5-6 says, "Be not anxious for anything, but by prayer and supplication, with thanksgiving, make your requests known to God, and the peace of God that passes understanding will keep your hearts and minds in Christ."
So we keep praying for the sick in the face of the lack of results, out of obedience to His word. Remember Daniel who started praying that the 70 years of captivity would come to an end according to what he saw in the Scriptures. It took three weeks for the answer to come back. The angel said that his prayer was heard immediately, but he had to battle the Prince of Persia as it resisted him and he had to get the angel Michael to come and assist him.
What this shows me is that although our prayers are heard as soon as we pray, the answer takes time to get through because of spiritual battles against the powers of darkness that hinder the outcome. The Scripture says that our warfare is not against flesh and blood, but against principalities and powers, and that our weapons are not natural but mighty through God for the pulling down of stronghold, casting down imaginations and every high thing that works against the knowledge of Christ.
So I am coming to the opinion that we are up against a spiritual opposition that does not want God's will to be done in the Church and in its mission to the lost. Therefore I am realising that it is not a simple matter of believers not having enough faith, or being holy enough. It is mainly because we have a devil and his demons opposing us. We see this in some areas of the Church where the waters are so muddied, that people can't discern truth from error.
So it might be a matter of spiritual warfare that is the reason why so few are being healed in spite of all the prayers and ministry.