I can see your point. The Gospels quoted Jesus extensively, but Paul seemed to do less of that. There does seem to be a difference in the way Jesus talked and Paul talked.
It seems reasonable to question Paul's adherence to Jesus' teachings, because Jesus claims to be both God and "Lord of the harvest". If that's the case, no harm could be done to Jesus' agenda if Paul is found to be deviant. And if Paul is in adherence to Jesus, then Paul's teachings should logically connect with Jesus', even if they seem to contradict.
The only problem is that Paul claims to be a servant of Jesus.
Actually Paul only quotes Jesus once, and even that's hearsay. Jesus claimed to be God? Where? Have you ever read the Gnostic Gospels? I find them to be a much more logical and reliable account. Here are the issues with Paul:
1. Jesus hand-picked his apostles. These chosen followers, who were left with the charge of carrying on Jesus' teachings, considered Paul to be a heretic.
2. Jesus' role as Messiah was to free the Jews. Paul went to preach to the Gentiles. What did they care for a emancipator of the Jews? Nothing at all. So Paul had to recast Jesus in each culture's extant mythology/religion. As he himself says, "I have become all things to all people." One of the earliest and most successful regions where Paul found success was in Egypt, and he did this by casting Jesus in the role of Osiris, a deity that the Egyptians could relate to. He did the same in other regions, and this is why Christianity today has so many Pagan influences. Again, none of this has anything to do with what Jesus taught.
3. Paul never met Jesus. Prior to his conversion (which, by the way, we only know about by Paul's own account), he had been a persecutor of Jesus' followers. What better way to subvert a religion than by declaring yourself a disciple and issuing false teachings? Again, the original disciples thought him a heretic because of his teachings, which were all ABOUT Jesus, AFTER the fact, and were nothing like what Jesus actually taught.
There is a big difference between what Jesus actually taught, and what Paul taught ABOUT Jesus.