Welcome,
Now "First layer Speed" (in "First layer settings", "Layer" tab) works for first layer of print. If there is raft, this settings work for first layer OF RAFT. OK - it's to help stick model to table and it's working.
But - in raft is "Separation distance" which makes first layer OF OBJECT to be print in air. And this should be done with less speed then rest of object (like 20%). But there is not settings for that.
Pleas add it.
I have tested it and it will be really useful option:
(ABS, raft, 0.1mm).
Printing whole object with 80mm/s isn't working (print is not sticking raft). With 15mm/s it's OK but printing takes about 9h...
But when I created second process to handle slow print on raft and my 80mm/s for rest of model - everything is working correctly. So it should work.