I do not know the answer to your question, but consider this:
The average American gets around 1/3 of their calories from low-nutrient grains, which are very high in phytic acid.
The average American eats limited fruits and vegetables.
The average American drinks a substantial amount of calories, which contains essentially 0 nutrition.
The average American still makes it into their 70's and 80's.
If you are following a Primal Blueprint style diet, your intake of phytate is going to be lower than the average American, while your intake of nutrients is going to be much, much higher. I do not feel you should be concerned about phytic acid. Consider buying your nuts "raw," soaking them for 6 hours, then drying them in the oven at 155 degrees F or so until dry (it may take a few hours, especially with cashews since they soften quickly). You will remove much of the phytate that way. However, I do not bother usually because I feel I eat a nutritious diet low in phytate and my nut consumption is intermittent at best. As long as you aren't drinking coffee with every meal, you're probably in decent shape (coffee is extremely high in phytic acid, I only consume while fasting and not with food because it can really hamper nutrient absorption), so don't stress IMO.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.