Play best-of-6 matches instead of games.
Better yet, play 10 to 18 games, and call it Dominion Legacy
Here are some things I do to let engines get bigger:
- Always use Platinum/Colonies
- Always use Dominate (ideally with Platinum/Colonies, since Platinum makes players more likely to reach Dominate, and Colony makes them less likely to buy Provinces directly)
- Include 12 of each Victory card in a 2-player game and 18 of each non-Kingdom Victory card in a 3-4 player game (you'll likely own extra basic cards due to them being included in both the base game and Intrigue)
- Play to 4 (or more!) empty piles instead of 3
Remember... Dominion Intrigue
2nd Edition does NOT include the "foundation"/start cards!