Realistic Progression Zero/One - Career mode for Realism Overhaul
Secondly, I'd keep trying to refine your gravity turns, and your final burn. Optimising the gravity turn is faaar more important than in stock KSP, since the gravity is far stronger and the atmosphere much thicker/deeper. One of the reasons I'd recommend going for 10km/s initially is that will let you aim for a higher orbit, which means you don't have to turn as fast or as accurately, and and of course it will give you more margin of error for your turn even if you end up going lower. Once you've got the hang of that, you can work on more efficient launches if you want to. Also, I'd recommend using mechjeb's ascent guidance feature if you aren't already. Pretty much everyone uses it for RO, because it's very very hard to do an efficient gravity turn manually, and there isn't really any realism in flying a rocket manually, they've always been automated. Make sure you set it up correctly for RO though, there's a guide on it here.
Multipatch to KSP to give things realistic stats and sizes
So, I'm not used to reading KER windows (MJ behaves rather better with RO and RP-1 because it supports the latest RF features--if you're going by KER you will get less delta V in practice than it tells you) -- is the delta V you're showing vacuum or atmospheric? Same for the thrust. I highly recommend reading False KSP Lessons and in particular Myth 1, it seems relevant. :)
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