I've done a lot of 4 people drafts and the deck quality does suffer somewhat. One suggestion I would have to helping to support lower number of people drafts is to increase the number of lands per guild. i would add 1-2 per guild and 1 per shard. Encouraging tri-color or quad color decks increases the number of "playables" in the drafts.
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I'm actively maintaining a comprehensive article to help explain to new cube players how some complex vintage level cards work in a cube environment. Vintage Cube Cards Explained
Vintage Cube Cards Explained
Here are some other articles I've written about fine tuning your cube:
1. Minimum Archetype Support
2. Improving Green Archetypes
3. Improving White Archetypes
4. Matchup Analysis
5. Cube Combos (Work in Progress)
Draft my Cube - https://cubecobra.com/cube/overview/d8i