Its an ale, yes 1006 is what beersmith says I will get using safbrew BE256, I know it will be higher more like 1008, 1009 (beersmith always overcalculate the FG)
The bitterness ratio in that beer will be 0.65, which is not that high (at least for my taste), my APA are usually 0.70 and my IPA is close to 0.95. But I never brew a beer with that low alcohol.
Yes the IBUs are calculated via beersmith. Im using safbrew BE256 (I know is a strange choice but I have 2 packages and I want to use it, also has 3.5oz of spalter in my freezer for a few months).
So addition at 20 mins will only give me bitterness and no flavor? If so I will skip the 20min addition and distribute it between 60 and 0min.
Well im not following any style really, I just have 9lbs of munich, 3.5oz of spalter and a BE256 in stock, thats my guideline

, I will also do 5.5gal of Vienna/Cascade SMaSH in order to compare between those two beers both with the same amount of grains,yeast, and with the same IBUs, I just want to experiment but without making something undrinkeable, noone wants to throw down the sink 11 gallons of beer

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Are really 25 IBUs that much? Like I said to Gnomebrewer, the IBU/SG is not that high (0.65) or Im missing something?
Oh and my Spalters are 3.4AA