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Ok a few related  things to understand.......

1. when you look through your viewfinder or on the monitor you are seeing a JPG image which is actual if you

 are shooting in JPG or extracted from the Raw image if shooting in RAW.

2. The histogram again reflects the details for the RAW image

3. If using the histogram as a gauge it is not therefore not giving you a good indication for your RAW images and

as Raw processing normally has better post processing recovery for highlights and shadows(dynamic range)

can be misleading.

4. Zebras are set at varying  "levels" for different reasons(the set level indicative of exposure level)....down at 70 this

will indicate start/low exposure levels and whilst not critical for a Raw shooter can be important for jpg based

portraits and ensuring facial/skin  exposure is correct.

5. For non portraits JPGs, 100 is the preferred set level for similar reasons and exposure needs to be lower than 100

because on JPG images you have less possibility to recover highlights and Shadows and hence you do not want your

exposure levels to be over 100 so that you recover exposure levels corresponding to 100 or less.

6. For RAW, low limit +109 is preferred because of the better ability to recover overexposed areas  in post processing

and at 109 the dynamic range of most cameras will accomodate recovery of highlight detail  and your EV/Monitor

will not be inundated with zebras until the low limit +109 is reached.

In shooting if you see zebras as a Raw shooter at a +109 setting then you need to adjust your exposure compensation

setting to eliminate the zebras on your EV/Monitor if you want to fully recover over exposure below 109 in post

processing..

Yes peaking is focus related and is for manual shooting and doesnt really have any bearing on Zebras..

Hope this helps to clarify........