According to my limited knowledge of warships:
1. There is indeed a technology to linear optimization the bow of ships, but only a few countries have this technology. With India's ability, it is impossible to master this technology in 20 years.
2. There are many reasons for such a large longitudinal swing of a ship, but the wiggle of the INS Vikrant should not be caused by a single reason.
3. The fighter needs enough deck wind when taking off from the aircraft carrier, so the aircraft carrier must move forward at full speed. When the aircraft carrier is stationary or sailing slowly, the fighter cannot take off.
4. The technology of manufacturing bulbous bow is very simple, Indian shipyards should have this technology. The problem with the INS Vikrant should be that Indians cancelled the bow sonar, but did not install fin stabilizers and other equipment.
5. The center of gravity of INS Vikrant obviously does not coincide with the floating center, which is not only the lack of bulbous bow and fin stabilizer, but also other problems have not been found. I suggest Indians check electromagnetic compatibility. And when Indians made the ship bow, did they modify the Italian process in order to reduce the cost and difficulty?
