You are only partially in control of your brand. Accept it, and move on. It is not enough to target anyone if you do not have anything to shoot them with. You have to engage them in your brand in order for them to work for you.
 
Who is in control of my brand?
I have heard, "Sean, you don't understand. Here is this list of blogs that reach the technical influencer demographic. We advertise there, and we know we are more likely to reach them."

First of all, they are not a demographic, but let’s just play the assumptive game. With what will you reach them? Banners, sponsorships, video, email? When you finally get in front of them, what do you say? And once you capture their attention, watch out because you have to make sure your product is up to snuff. More than any other group, influencers will see your foibles.
 
Just capturing the attention of a subset of what reaches the tech influencer through blogs isn’t enough. They are but one link in a massive influencer network. Granted they have more reach, and seed a lot of influence, but those they reach often disagree with them and have their own cliques. Influence is not a downward linear cascade but a dynamic chaotic system much more akin to chaos theory than a tree structure.

Don't be afraid to pull back the curtain
Companies like Nielsen BuzzMetrics allow you to monitor what is being said by your consumers en-masse across the digital realm, monitoring "buzz" so you can get the underlying pulse and measure what was once un-measurable. Affinitive enables you to design programs that assemble those internet armies of advocates.

Bring in tools to help you monitor that conversation out in the real world. Focus groups are often directed constructs for the client. Learn to use them correctly for segmentation and ethnographic research to pull apart what they think of your brand, product or company-- not as decision makers for your company on what logo they like better. If done right, you will come to the realization you are not in control of your brand-- they are. It is disarming. The closer you get to them anonymously, the more you will be offended by what you hear about your company and product. Do not be alarmed. Marketers are used to being at the stratospheric levels of communication monitoring. Fluctuations get normalized there.
 
Concentrate initially on your product --  not the message --  for it is through these research and monitoring efforts that you will learn what you can say and who you should target, and be able to determine how well that message is taking hold.

Stop saying "we are going to target the technical influencer." They exist, but you can neither determine who they really are, or accurately find them efficiently. Start asking, "Who can we get as a consumer?" "Who do they aspire to be?" "How can we use those insights to develop a message that resonates?" and "What cracks are in the competitive landscape that can make it ownable?"

Then pay for the research to find out. Otherwise you might as well be throwing feces at the wall for all the good your ad dollars will do to move your brand.