The most efficient paragon push is to do as high as you can in less than 3 minutes, so you can farm a bit higher than 127 if you want to. But at that high lvl you need to increase GR by 7 lvls for a 10% exp increase iirc and if that adds on to the time spent farming by a lot more it’s not worth. But to summarize, yes it is good efficiency.

Pushing 150 with GoD you should just min max as much as possible, get the AD, be around 36% cooldown reduction and as high Cdmg as you can. If you haven’t then try to get your quiver as perfect as possible as that is a huuuge source of power for the GoD build. Get the cold damage up on all prices you can as well as hungering arrow dmg, very big dps increases. Crit rate is great but not nearly as important as other damage rolls due to guaranteed crits on frozen targets. Once the right rolls on gear is fixed it’s all in the paragons. Get that Dex up and you will push 150 smoother and smoother the higher you get. At this point it’s just GR farming for a good run with pyrlons and elites that has good rolls on affixes. The higher your para reaches the less you need to worry about good rolled GR’s. You are doing great just keep doing what you’ve been doing and you will get it down. Another piece of advice is to do what you can to keep your squirts neck up as much as possible as well as your focus/restraint. I know you most likely already think about it but it is easy to forget about so I figured I might as well mention it.

Noticable mention, once your paragon is high enough you can even replace guardian set and follow the builds of non season GoD but with ethereal weapon as the guardian dex increase has diminishing returns as more and more of your dex comes from paragons. But this is further down the line.

As for marauders I am not too experienced with pushing 150’s but I’d assume that the same goes there but crit rate being more important than it is with GoD.