Dawn:
Some I mix standalone, mostly it is mixes. Rose candy I found is best for me at about 20% - I like a very strong rose blast.
Huckleberry is VERY strong: I usually do 10-12% for a strong fruity flavor. A few drops of huckleberry will add *oomph* to milder fruit/berries like dragonfruit, but will just as quickly overpower them. A 75/25 mix of huckleberry and cucumber at 15% will make a wicked juice indeed! Based on the two recipes you provided I assume you tend to lighter flavoring: huckleberry may be best at 5% for you: it is quite potent.
Toasted almond is very flavorful but a lot of it is required to bring out the true taste. I mix it 80/20 with peanut butter for a deep nutty juice. I mix it with tobacco flavors (usually marlboro) 60/40 to augment those as well. Note that 60% almond will still be subservient to the 40% of most any tobacco.
Honeywood tobacco I use at 8-12%: I like it strong but the scent is unpleasant to some (though others liken it to black & mild). Marlboro I keep at about 10%. Both with heavy doses of tobacco absolute.
Hickory smoke is, like, the strongest flavor produced. I like it solo, most don't. Add 3-4 drops to nutty or savory flavors for a strong accent. Obviously, one drop too much and it will overpower anything. I like it with vanillas as well.
Acai is another great taste, but so... "deep" I guess that I tend to use a lot. 15-20% maybe. I do a huckleberry/acai/cucumber mix that tastes like organic sweet-tarts. 60/20/20 acai, huckleberry, cucumber respectively.
Cucumber itself has little "flavor" but much "note", just like a real cucumber. It adds a fresh, crisp aspect to anything: I liken it to the first deep breath of Spring air in the morning. It will never overpower anything but will bring out a fresh/crispness in fruit and berry flavors.
