It seems so.
The boards are fine, though. I’ve kept counting them like in my previous post. Stopped about a week ago and I’m not going to continue. Here’s what I have:
Average number of tiles for 254 boards where I attacked with 5-colors:
7.08 R
6.92 G
7.14 B
7.02 P
6.84 Y
Average number of tiles for 179 boards where I attacked with 3 Purple and 2 Blue:
7.13 R
6.84 G
6.88 B
6.99 P
7.15 Y
Unlike you, though, I’ve made screenshots of every board, not just of those I didn’t like.