I'm running mag stacking mag NB build (necro + shackle + domi) and I was wondering what I should be using between incap vs soul harvest.

tooltip shows soul harvest does more damage, although technically both are supposed to scale off my highest resource (magicka)...but I guess since Incap is still a "physical" ability, the CP points into spell abilities don't apply to incap, and that is why the tooltip shows soul harvest being more damage. Can anyone confirm if my assumption here is true?

Even though the soul harvest tooltip is more, I'm debating going to Incap because I notice that getting a soul harvest + merciless bow combo doesn't seem as smooth to pull off, or at least how I've been trying to do it. I've been trying to do some combination of stealth + heavy attack into soul harvest + bow, but this gives the enemy a chance to dodge the bow since there is no hard CC. So I've tried stealth + heavy attack into flame reach to knock back, then soul harvest + bow...but when you use flame reach it knocks the enemy back and then you have to do this awkward sprint for a second or two to get to the target before you can hit your soul harvest/bow combo. I've also tried to stealth + heavy attack into soul harvest + flame reach + bow, and this seems to work well, but of course they can dodge the flame reach.

So I'm debating if it would be better to just use incap instead. It seems like it would make the stealth + heavy attack into ult + bow combo just more smooth. But then if it does do less damage, that might not be enough to finish the target...

Anyone good mag nbs care to chime in? Does incap do considerably less damage than Soul Harvest in CP? Or do you have a good combo to make sure soul harvest + merciless bow ability both hit consistently? I'm not running fear right now, since it seems like fear and flame reach kind of overlap and it's hard to find room on your bars on mag NB. I would have to drop refreshing path or degeneration (thus requiring spell damage potions).