Dan, Les Chic Chocs get a lot of snow in March and April. This season is a bit screwy, so who knows what the Snows will be like.
I have only been up 3 times, but in each of those mid-April visits there were fresh snow avalanches to deal with. Even down at the roadside attractions there was powder snow on all North Facing aspects. One year the powder was a bit mushy to start, but gradual cooling dried it out nicely...and it snowed!
Yes, it is a bit of a chance....Taking that chance it is usually well repaid. If it warms up or is sunny there will be more than enough corn snow on he southern aspects.
Snowpack : The melt freeze crust present at all altitudes has more thickened and forms a very hard shell of 25cm thick. Dry snow is covering it in places sheltered from the N wind in the Mines-Madeleine sector only.
This is the place to go if you are fast on the skin track or can get invited in for an overnighter.