The vdroop setting is basically like offset voltage control, except instead having control to +/- voltage, you only can give a negative offset (technically, offset is always positive and droop is negative, but colloquially 'offset' refers to voltage control where you use an +/- to VID and allows for downvolting during low load as opposed to manually entering in voltage).
It's because MSI, in their infinite wisdom, heard the people's say they wanted manual voltage control on their motherboards when MSi was the only company who didnt have manual vcore adjustments on their boards. So on their Z77 line-up, they removed offset voltage control and put in manual vcore. They didn't get it that people want and need both voltage control options, it's not a matter of one vs the other.
The MSI Z77A G41 and G43 are the only 2 boards in MSI's lineup that have offset voltage control (because they lack manual vcore control) and they cap the max offset so your max vcore is basically limited to about 1.3v (and no one has ever overclocked above 4.7ghz stable on less than 1.3v). Frankly, the MSI Z77 G41/G43 are the only 2 boards I'd even consider by MSI on z77, and only if they are about $20-40 (i paid $20 for my g41, it's a piece of crap but at $20 I'm happy with it). I would never buy MSI for a quality motherboard, they are worse than asrock on z77.
You can use the vdroop voltage to subtract voltage from your auto vcore, but 99% of the time, people have to add
voltage to their auto vcore when pushing 4.5ghz+. Otherwise it's manual vcore only, meaning no powersaving options, which is terrible for a 24/7 overclock.
If there is any way to keep voltages constant (i dont want to set bios voltage as 1.18 or 1.185 and get 1.176 at full load)
I'm not sure what you mean, it should be easy to use manual vcore, just enter it in. If you mean you want a constant voltage, that will never happen. Software vcore readings are an average of your vcore, which is constnatly going up and down rapidly (no vcore, or voltage in general, is truly stable). Instead of showing you crazy voltages in software and bios, you just see a stable average vcore. I can guarantee you, you real vcore is not the same, and not only that, but things like voltage spikes and droop, cannot be seen by software because of how it averages everything out. It's very likely that your motherboard will show your voltage going down slightly when in reality it's peaking. You really need a digital multimeter to see your true voltage.
Just take the voltage reading you get in software, as a ballpark of what your real vcore is. You have to use a DMM to see the nuances, vdroop, etc going on. Also, what you set voltage in bios, what you see in vcore... none of that matters (likely you just have multiple options on your board's voltage control but in reality you have fewer options, so 1.4 and 1.4125 are actually just the same voltage being fed). Your real vcore will never be exactly what you set in bios or what you see in software, just use a DMM if you are really particular about this stuff.
Temps seem fine, but slightly worried that maybe it not seated all the way. I get ~7-10c difference between cores.
Normal. Some of the cores get worked more, some less, some of the cores are more in the warmer center of the chip...
Fill out your sig rig, it's a bit confusing to know what you are talking about when we dont know what you have.