The 50% is a start, but it's not nearly enough.
On Italy, Crackhouse, Militia, Assault (worst one) and even Office, a good alchemist duo and shadow hunters defending them will shut down the entire enemy team and give them barely any chance unless all of them go op races, and this also mainly happens on T side on all those maps which is usually what people stack just to make it worse.
It's not fun being on fire the whole round even if you can evade 50% of the time now, with 2 or more alchemists you can even double cast and get the people who evaded the first one.
This always leads to people leaving on the other team, which is not good for the server. So either make lace guaranteed, or balance it in some other way, cause this is hurting the server.