ContractConfigurator VS EnvironmentalVisualEnhancements

In terms of remaining mostly stock, I'd recommend Kerbalism and Contract Configurator with a few contract packs (second comment has a list) that fit your playstyle.

Contract Configurator Wiki

Also contract packs can be customized by creating/changing cfg files with a well documented API

BoulderCo

Here is link number 1 - Previous text "EVE"

Environmental Visual Enhancements

You'll want EVE. And if you're getting EVE (don't forget to get the configs file too, it's older, giant, and very necessary), you'll want Scatterer too. Naturally you'll be in orbit and be all like "where's the stupid light reflected from the ocean!" and then you'll need Planetshine.

https://github.com/severedsolo/CleverSat/releaseshttps://github.com/severedsolo/ExplorationPlus/releaseshttps://github.com/jrossignol/ContractPack-FieldResearch/releases/tag/1.2.2https://github.com/jrossignol/ContractPack-Tourism/releases/tag/1.5.2https://github.com/DuoDex/CrowdSourcedScience/releases/tag/v6.0https://github.com/TheDarkBadger/DistantObject/releaseshttps://github.com/bfishman/Docking-Port-Alignment-Indicator/releaseshttps://github.com/WazWaz/EnvironmentalVisualEnhancements/releaseshttps://github.com/linuxgurugamer/ClickThroughBlocker/releases/tag/0.1.10.15https://forum.kerbalspaceprogram.com/index.php?/topic/54284-18-110-extraplanetary-launchpads-v683/https://spacedock.info/mod/1972/Filter%20Extensionshttps://github.com/linuxgurugamer/FShangarExtender/releases/tag/3.6.0https://github.com/Orthethac/HideEmptyTechTreeNodes/releases/tag/v1.3.0https://www.kerbaltek.com/hyperedithttps://forum.kerbalspaceprogram.com/index.php?/topic/106243-181-1112-interstellar-fuel-switch-ifs-3294/https://spacedock.info/mod/175/Interstellar%20Fuel%20Switchhttps://github.com/TriggerAu/KerbalAlarmClock/releaseshttps://github.com/ihsoft/KAS/releaseshttps://github.com/jrbudda/KerbalEngineer/releaseshttps://github.com/ihsoft/KIS/releaseshttps://github.com/KSP-RO/Kerbal-Joint-Reinforcement-Continued/releaseshttps://github.com/taniwha/KerbalStats/releases/tag/v3.1.0https://forum.kerbalspaceprogram.com/index.php?/topic/89285-18-kerbalstats-v310/https://github.com/kopernicus/kopernicus/releaseshttps://spacedock.info/mod/302/KRASH%20-%20Kerbal%20Ramification%20Artifical%20Simulation%20Hub%20%28simulation%20mod%20for%20KSP%29https://github.com/CYBUTEK/KSPAddonVersionChecker/releases/tag/1.0.3.3https://forum.kerbalspaceprogram.com/index.php?/topic/173818-181-1112-ksp-interstellar-extended-12810-release-thread/https://github.com/shadowmage45/KSPWheel/releaseshttps://forum.kerbalspaceprogram.com/index.php?/topic/106369-19-modularflightintegrator-127-19-october-2019/https://github.com/linuxgurugamer/PatchManager/releaseshttps://www.curseforge.com/kerbal/ksp-mods/photonsail/downloadhttps://github.com/prestja/ksp-planetshine/releases/https://github.com/radistmorse/KSPPreciseManeuver/releaseshttps://github.com/JonnyOThan/RasterPropMonitor/releaseshttps://spacedock.info/mod/1547/RCS%20Build%20Aid%20Continuedhttps://spacedock.info/mod/2286/Real%20Exoplanets?ga=%3CGame+3102+%27Kerbal+Space+Program%27%3Ehttps://github.com/KSP-RO/RealPlume-StockConfigs/releaseshttps://github.com/S-C-A-N/SCANsat/releases/tag/v20.4https://github.com/DoctorDavinci/ZeroMiniAVC/releases/tag/v1.05https://github.com/LGhassen/Scatterer/releaseshttps://forum.kerbalspaceprogram.com/index.php?/topic/162775-131-poll-sunflares-of-maar-gpp-bundle-v12-jan-23-2018/https://spacedock.info/mod/74/Science%20-%20Full%20reward!https://forum.kerbalspaceprogram.com/index.php?/topic/64987-18x-110x-smokescreen-2814-extended-fx-plugin-18-april-2020/https://github.com/shadowmage45/TexturesUnlimited/releaseshttps://github.com/linuxgurugamer/ksp_toolbar/releaseshttps://spacedock.info/mod/127/TweakScalehttps://github.com/jrossignol/WaypointManager/releases/tag/2.8.1

EVE Redux with SVE configs, for clouds

If you installed manually and are in 1.8.1 or later, https://github.com/WazWaz/EnvironmentalVisualEnhancements/releases scroll down to release 1.2.2-2, you should find the configs there - they are the correct ones.