Is it normal to hear everything so clear and loud while monitoring the mixer during the take, but it quiets down during post?
I'm a starting recordist and doing my first student/no budget indie gigs to build up network and xp. In the end I'd like to be a boom op. I've picked up a used SD 442 and a Tascam DR680 mkII as it was the cheapest setup I could find, and use an Oktava MK012 hyper cardio or a Sennheiser MKH416. I record ISOs so I don't have to worry about any mix and can focus on booming during takes. I don't have enough gear to give director and continuity monitoring anyway (yet) so not mixing on set isn't that much an issue.
Every day I setup my gains the same way aiming for around 0 dbu on the 442 meter, then I equalize the Tascam levels to match the SD ones. During takes I monitor the mixer, master fader is at 0, monitoring fader is right up at noon, and it's like I can hear everything clearly, loudly, every single noise, every fabric movement. And sometimes I feel I'm getting noisy useless recordings. I did a bit of post during my training course, so I know how much you can clean up sound now, but still I feel like I'm way far off the ideal recording of having only the performance and nothing in the background. And I don't turn down gain because I was told to push it as high as I can to have the best signal-to-noise ratio, as it's the preamp role to do so and they're good at that. Hence to 0 dbu gain setup, and aiming to not go too much above 12 dbu.
But then after shooting I listen to the recordings (I have to because the Tascam take naming system is clearly being pushed past its limits so I have to rename every single file by hand), I use VLC on my personal computer, my DT 990 Pro, volume is at 100% on the OS, 125% on VLC, and the level is clearly not the same. It feels average, almost too quiet given the playback settings. It feels a lot clearer too, like I can still hear the stuff that bothered me but couldn't do anything about on set (fridges in a restaurant for example) but the overall noise level feels way down, like a proper recording that still needs post of course but at least I could say "yeah this is the best I could do, I'm satisfied by the result".
So is this normal? Is this how it's done and I must train my hear some more to be able to better listen on set and detect what's acceptable and what's not? Or is there a problem somewhere in my technique, my setup? Is it maybe just a consequence of my playback setup and a proper mixer with ProTools will hear everything like me on set?