[Bobcat]

Another suggestion to check if your secondaries are opening is a trick I learned years ago when racing . Take a piece of vacuum line slightly smaller in diameter than the secondary vacuum shaft ... about 1/8 " long and split it lengthwise and then put it on the shaft up as far up as it will go . Drive the car wide open and then look at the tubing . This will tell you not only if the secondaries are opening , but how far . Think of this as a travel indicator like is on a shock .
I also like all the other suggestions .... something like this can drive you crazy ... or in my case , crazier !!