See how your Lexicon Duel deck actually behaves. Draw hands, see what vowel/consonant balance looks like, run 1000 simulations to check your assumptions. All client-side.
How often does your starting hand have at least N vowels? Run the simulation:
A too-vowel-heavy deck means easy short words but low scores. A too-consonant-heavy deck means frequent dead hands. Scrabble's distribution is the result of decades of tuning. Use this tool to understand it, then decide if Lexicon Duel needs to tweak it (e.g. slightly more vowels for faster pacing).