This isn't going to eliminate your tax bill, but it might help a little. A long time ago a friend of mine owned his own company and he paid himself $120k/yr. He had a GF who had been with him for 10 yrs so he filed as single and she had no income. I told him to hire her at his company and pay her $40k/yr. Then reduce his pay to $80k/yr. She didn't actually have to do any work, just get her on the payroll and reduce his income to $80k and make sure they file separately.
This dropped his federal tax bill from 24% of $120K = $28,800 to 22% of $80k = $17,600. Her tax bill was 12% of $40k = $4,800. Together they paid $22,400, a savings of $6,400 or roughly 22%. Between the 2 of them they still made $120k/yr, but they got to keep $6400 more per yr.
I know you're married, so this wouldn't work for you, but if you have a kid or couple of kids who you could hire at work, it might help some.
My ex-FIL was a master at writing off business expenses. He flew down to MX to meet with clients and chartered a Learjet for 3 days and took his best friend with him. Him and his best friend each got to fly the Learjet for about 15 minutes each. When they landed, he met with the client and the next day he took the client, his best friend and the pilot deep sea fishing for most of the day. They finished up the deal and he wrote off the entire trip as travel expenses. You could do the same with your Glamis trips, write the entire expense as advertising or marketing.
On a slightly related note, I know a guy who made $6M/yr, but didn't want to pay for his son's college education. He hired a film crew to make a highlight reel of his kid playing football. They mailed out several hundred copies on DVD and his kid got a full scholarship at St Joseph's. He put a down payment on a 4 BR house near campus. He gave it to his kid, who rented the other 3 rooms out, which covered the mortgage. He gave his kid an Escalade, the 4 guys hung out and partied like a posse and when he graduated 4 yrs later, he sold the house and the profit from that was more than his entire tuition would have cost. He came back to San Diego, worked for his father at Met Life and put the house profits down on a house worth about $1.5M at the age of 23. That whole family knew how to work the system.