Ive got some Spirit that tested at 24.6%, most strains hit 17-19%, the exceptional ones hit up to 27% - (25.6% -Lechuga de Diablo- is my best) It really varies even in the seeds of the same strain, so find those super moms. I also recommend getting the same seeds from diff banks, you will be amazed at the difference. This is why i am having issues.... I have used some of the "best" coffeshop seed companies, and had worse results than from crossing some "OK" company seeds of the same strain together and beefing them up myself.
My advice is this...
Plant as many seeds of one strain as you can afford, grow both the male and female (separate them obviously) and find the strongest ones, cross those, then cross the new seeds against the other super moms and dads (i.e with 2 male & 2 female from seed -AxB & CxD & AxD & BxC=AB,AD,CB,CD (keep 4new super males & females out of the new bunch with the 1st bunch of super parents-6 total)-Then you cross it to have= ABxC,ABxD,ABxCD,ABxAD,ABxCB,ADxC,ADxB,ADxCB,ADxCD,CBxA,CBxD,CBxCD,CDxA,CDxB...you can keep going with the 3rd gen (ABCxD,CDBxA, etc-and yes-HOW you cross them makes a difference), but you really need a notebook or computer log lmao. You will fill up an area fast, but as you go, you kill off the ones that arent as good. This process takes several harvests to get the strain to where you want it, but you can make a simple strain better than the original...
In a few months, I should have time to put up some awesome diaries and "manuals" on the diff things i learned. Never really cataloged my stuff before(security paranoia). I'm more than legal, just old school.
My new "Lab" will be sweet. Tents for control strains, some new equipment for extractions and mixing & filling
. Finally seeing some return on our investments- so i get to start being a scientist again-not just a farmer...