Your problem is the Pilot goes OUT after the first time the main burner comes on and cycles OFF after the Oven has reached preset temp. NO ADJUSTMENT OF THE PILOT IS NEEDED. I have yet ever adjusted a Oven Pilot light flame in 41 years. They are usually dirty or clogged. NOT the problem in your case. In older Ovens this type problem was fixed by replacing the Oven Temp control assbly. But, in newer ovens it is a defective Pilot assbly, usually. There are 2 things that fix your problem. Doug
1. Defective Oven tstat
2. Defective Pilot assbly