I've been trying to get the Soyuz rocket assembly to send a crewed Soyuz spacecraft into LEO, but the Soyuz rocket assembly seems under powered for the task. I start to lose speed once I drop the four liquid fuel boosters maybe around 20,000-30,000 meters up. I am thinking that one of these factors is causing this issue:
1. It's because I'm using the Realistic Solar System mod.
2. I'm not timing my gravity turn correctly.
3. I've constructed the rocket assembly incorrectly/rocket assembly is overweight.
Could anyone help solve the issue I am having? Thanks!
(Here is a link to a photo of how I have the Soyuz rocket assembly built)
https://imgur.com/a/tlAsXtx