Question for Iceflame quilt users

I live jn Gernany and am looking to extend my bike/back packing trips until October.
Had a lousy experience with traveling the country with a simple Naturehike summer sleeping bag (cold, narrow) and am looking to upgrade.

I have no idea regarding down feathers- I guess 850 pf is enough?
And then adding 100 or 200 g Down, is it needed for April/October?
I care about weight, I dont see myself camping in winter… its only the in-between seasons I worry about.

If you could share your perspective it will be helpful. Thanks!