I'm curious to hear how your deck performed, Enlisted Wurm used to be a favorite of mine when I first got into EDH!
There's no easy answer for you question about whether or not to include a few cards that don't directly synergize with your list's core strategy. To me, the choice to include unusual cards happens because either I really enjoy the cards and want to play them even if they are suboptimal to overall performance; or the deck's core strategy is easily disrupted and it needs a solid backup plan.
In practice, this usually means that about 90-95 of the non commander cards all follow the same plan and then 5-10 of them synergize with my commander in a way that the other cards do not. Thinking about a list with Perrie the Pulverizer at the head, this would look like ~95 cards that care about a wide variety of counters and +1/+1 counters and then maybe a couple cards that really work best when paired with attacking with a single large creature like [[Duelist's Heritage]].