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A couple of points:
The vast majority of a mix's loudness comes from the mix, not the mastering. If you ask a mastering engineer to bring a bad mix up to "competitive levels", you're going to end up with a crunchy mess. So if you want a clean, loud mix, that's your responsibility as the mix engineer.
Talking about compression in general terms is meaningless, and dangerous. Some people may read it and think they're learning something, and then a month later we get someone writing a ridiculous statement about compression in a forum post, because "that's what they've learned". Talking in generalities is especially dangerous with regard to compression, since in the first couple of years of mixing experience, while one's ears are improving, it's more difficult to hear the unwanted side-effects. EQ, distortion, delay effects are typically easier for the ears to pick up on.
However, this is understandable - in the first couple of years, some of us only think of compression in these general terms, and hence only apply them in these general terms. We may simply say "route all basses into a group, and apply 2 dBs of compression with the threshold a bit under where I'm seeing the maximum level hit, and let's make the attack as fast as possible. There, done". We don't stop and specifically analyse our sounds and say to ourselves "that mid bass is drifting in and out of the mix, I need to make that more solid", then work out if compression is the correct tool to use to fix the problem (it could have some modulation running over some parameter, which could be removed), then work out the specific compression settings for that sound.
We need to identify the attack transients of each sound we're compressing, and whether we want to retain those transients or not. Especially for snares, hi-hats, if we run them through a compressor with a fast attack time, those sounds are going to become quite dull, depending on the other compressor settings. In terms of the release, we need to be able to hear whether the compressor's "pumping" aligns with the song's groove, or works against it. Setting an incorrect release time can kill a song's groove. The ratio and threshold work in tandem, and depend on the answers to "how much do I want to even this out?" and "at what times do I want this sound to be uncompressed?"
Also, so far the discussion hasn't touched on sidechain compression at all. It's quite common for a sound to be "evened out" within itself, then sent into another compressor so that it gets out of the way of the kick, or the main lead, or some other element of the mix it may clash with. Sidechain compression is more straightforward, with the main aims being allowing the main sound to come through cleanly, while retaining/enhancing the song's overall groove.
Once you've worked enough with compressors and understand exactly what you want to do to a specific sound, and how the various controls are going to influence the sound, compressors change from "mysterious black boxes which magically embiggen and glue sounds" to really straightforward effective tools which help in creating really solid mixes.
In terms of the OP's original setup - without knowing specifically which sounds you have in each group, and which specific compression settings are meant by "lite/moderate", whether any of the compressors are being side-chained, and whether you're using the compressors only for function, or whether you're also using them for adding tone, I have no idea whether it'll work for you or not. Each sound, each mix is different, so you're the only one who'll be able to answer that question.
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