Gravitational Fields and Gravitational Waves

I have noticed that the Venus precession data 8.6" obtained by GR calculation is very inconsistent with actual observations. Is there any accurate data now? I also calculated the precession data of the eight major planets in the solar system. Mercury 43” Venus 240” Earth 3” Mars 1” Jupiter 0.8” Saturn 0.1 Except for Venus which is 240", other data are consistent with GR. I want to know which of 8.6" vs 240" is correct. I wrote a letter to a physics professor, and he replied “I am not an expert on astronomy so I cannot answer your question whether your calculations are right. But since 5 out of 6 answers are correct ... there are good reasons to assume also your Venus-computation is correct. But since I have worked with GR for 50 years now - I can assure this theory is misleading. So, we are stuck in the classical problem - we know THAT GR is misleading - but not HOW. But we will find out some day! This problem in fact has stalled all science --- we know THAT it does