What is your highest level crafter? Are you crafting 1star or 2star items at level 50? These items are significantly more difficult than crafting while leveling up. We are level 50 crafters in multiple classes, what we are talking about isn't for doing crafting at level 20.
I ALWAYS hit 100% quality. Always. If I don't it's almost pointless to even attempt completing the item.
I don't think you understand the method we are using for crafting, it has been posted about significantly, and any crafter at 50 trying to make expensive items uses it, or some variation.
Here is a couple of posts, which I'll kinda summerize below:
http://www.reddit.com/r/ffxiv/comments/1mh6um/crafting_guidetheorycrafting_dont_let_crafters/
http://www.reddit.com/r/ffxiv/comments/1moje4/indepth_crafting_mechanics/
http://www.reddit.com/r/ffxiv/comments/1n7tlf/indepth_crafting_mechanics_part_deux/
Inner quiet - Every time you complete a touch ability you get a stack of inner quiet, each stack boosts your control. At the maximum of 10 stacks this is better than a "good" quality.
Rumination - Uses up the Inner quiet buff to give back CP.
Byregot's Blessing - Efficiency: 100% plus 20% for each bonus to control granted by Inner Quiet. (Consumes the inner quiet) So at 10 stacks of inner quiet, this is 300% efficiency . Basically a free excellent condition when you want to use it. (I really wanna see a lucky Byregot's Blessing during an excellent, with both great strides and innovation up!!!)
The synergy between these 3 skills is what we use to maximize our quality gains for a synth. Hasty Touch is used in conjuntion with Steady hands II in order to maximize success and minimize CP use. This way we can save all our CP for durability. The goal isn't to maximize the quality gains on each hasty touch, the goal is to have MORE hasty touches. So the point is to use TotT every single time it's up. This gives more CP, which gives more durability, which allows you to use more hasty touches. More hasty touches lead to more stacks of inner quiet, which means you get ever increasing amounts of control. After just a few stacks, inner quiet is better than missing a few goods, and at 10 stacks, you open up the greatness that is the synergy between these 3 skills.
If you use Great strides + Innovation + Byregot's blessing you will get 2000-3000 quality. MASSIVE boost, that generally maxes out any quality, even on 2 star items.
Otherwise you can use Rumination to get 60 CP back with 10 stacks of inner quiet. So if you hit 100% quality already, this gives CP back to easily complete the synthesis of an item.
If you are afraid of losing some steady hands II buffs, don't worry, you will more than make back the CP cost of that buff using TotT. SH2 is 25 CP, and has 5 stacks, so this is an effective 5CP per buff. TotT gives 20 CP, so you are afraid of losing 5CP for 1 stack of the SH2 buff to get 20CP back. You are COSTING yourself 15CP. There may be a few times towards the end of a synth where I use the good condition because I know I don't need any more CP, and it'll help me complete a synth quicker, but during the quality building phase of a craft, it is nearly always best to use that TotT during good.
I hope this helps explain the crafting method we are using, and why not using TotT is a bad idea. And as a result, why WNWN is not a bread and butter skill to "increase" durability, because you have to skip using TotT.