Well, Spent half evening and created personal character Fusion girl body and OCBP physics. I'm satisfied what I achieved - maybe in future will make some tweaks for body but for now it's very ok. As I don't like use Bodyslide, body preset was created with Screen Archer menu + ZBG mod, which contains ZEX in-game sliders. I had some base preset created in Bodyslide, but it's totally reworked with in-game SAM sliders. 

Browsing LL forum, found Breast Pushup System for FG. It's pretty cool mod, haven't tested yet, but it's work very well in downgraded game. Main thing of this mod is that you can manually adjust breast push up + cleavage in MCM and these sliders values will stay as main push up in rest of time. Breast push up will be visible when something will use armor slot 33 (Body). There is only one issue for me (but it's in my side) - I'm using comfy boots which takes slot 33 - that means when my character equips boots, push-up effect will apply. Tried to change slot for boots, but then overlays on body started to blink. So, I left it as it is right now. But it's cool when you don't need to build different body shape for clothes in bodyslide if you want to see push-up  

Next thing - OCBP physics. I have mid pc and it cannot provide stable 60fps. So, one modder released a mod for mid end pc - OCBP and OCBPC FO4 - FPS Fix with MCM Menu. This mod was like wow! for me - finally my character will get a jiggle. Now I switched to OCBPC - really don't understand this collision thing, because in animations/idles where character touches titties, collision work not very well. It's pretty weird, let's say. But hey!, it works at least! Maybe I don't know how to configure...So, what I wanted to say. With OCBP LPCE physics mod you can tweak jiggle and collision spheres right in game without exiting it. Lot of sliders, values etc...But I made something what I like. 

Need to figure out about Comfy boots (why body overlays is blinking when changing slot for boots) and need to understand more about collision spheres. But that will be tomorrow....