A Handful of Spell Effects Questions

[AstralFire]

So I'm trying to create some new spells via the Creation Kit, but the poor documentation of a lot of the functions drives me mad. If anyone with some experience could chime in, I'd appreciate it:

 

- I tried to make a negative taper effect work for a buff, and it just did nothing at all until I removed tapering entirely. What did I miss here? Does tapering only work for damage?

- Is there any way to attach a duration effect after the end of a concentration period? This doesn't work in the frame, so I'll need a script; what functions can I use to grab when the player stops concentrating on a spell?

- What function do I use to get the type of attack used against the subject?

 

I currently have two spells I'm working on.

1) Was supposed to be a concentration spell that increased one-handed weapon damage while concentrating by a moderate amount, along with minor healing. Releasing would have resulted in a short, 3 second upward spike of damage through tapering, allowing for one really powerful attack if very well-timed. I settled for making it an instant-cast fire and forget with a 6s duration that improves heal and stamina rate, but I'd prefer the original idea if possible.

2) Trying to create a master-level circle that gives 50% Magic Resist and 50% arrow failure against any friendly target in the circle. The Magic Resist I'm poking at, but it should be simple enough (I'd appreciate any insight there, though.) I have no clue how to proceed with arrows - I thought I'd just refer to the effect used for Deflect Arrows' perk and remove the blocking conditional requirement, but I have no idea how to call on that for a spell effect.