Ideas
Yes, they are too slow in the dry, but in wet conditions I think they are too fast, even for 110.
I can assure you that the difficulty level in the wet at 110 is a good level for those who race at a high level — I have proof of it. I believe the dry difficulty needs to be rebalanced, as it's too slow compared to the wet, and it should be brought up to the same standard.
Obviously, for those who are about a second off the pros, once this issue is fixed in this way, they'll need to play at around 100/103 with a proper setup.
To sum up, there are two problems:
1. Dry difficulty is too easy.
2. As a result, there's a disparity when using the same difficulty level in the wet — but the solution here shouldn't be to lower the wet difficulty, rather to raise the dry difficulty to match it.