That's a tough way to determine yield. Most growers go by gram per watt or GPW per 30 days of veg. A rule of thumb is 1/2 gram per watt is average. 1 gpw is considered good to great depending. I have some strains that will produce 6-7 grams per cola, I have other strains that won't yield 3 grams per cola. Just the way it is. Is it the Tahoe OG that you're growing under the 345watts? If that's the case you're not gonna be thrilled with yield. She's a low yielder under all the light in the world. I would say look at some different genetics after this run and find something that's known for an above average yield. Are you in Oregon? If so you may be in a ton of luck, as I am in Oregon as well... Let me know bro...
W.C.C.