Just got off the phone with Traxxion Dynamics, and he was very helpful. I won't be able to remember every detail, but I'll share the basic points here to help others.
You can't compare their recommendations for a given bike/rider with the recommendations from another company because it isn't an apples-to-apples comparison. Their damper rods are different than drilled-out OEM rods, and even some of the spring dimensions are different, thus oil displacement is different, etc. I think he was also saying I'd get some of the advantages of a stiffer spring, but other factors cause the system to also react as if they aren't as stiff (my words).
Also, whoever mentioned using 20 & 30wt oil was because they don't make 25wt was actually right. Traxxion said you probably could mix them, but it's just easier this way. I was concerned this might cause uneven stress on the fork legs, but he assured me it's all good, is commonly done, some forks are designed with spring on one side and damper on other, etc. (like someone else here mentioned).
To be clear, don't use Racetechs spring-rate calculator to figure out springs from other companies. Check it out with them before ordering if you are buying their springs. Also, if you buy the kit I got you just enter your weight and bike, and they do the calculations.
Hope I relayed the info clearly, but I feel much better about moving forward with the install now.