Titegroup Pressure Spikes

Searches on this subject haven't been very fruitful.  I maybe should know this so lay it on me.   I've read many threads saying bullseye shooters don't like Titegroup because of pressure spikes.   Being TG is my go-to powder because of availability, I'd like to know if someone out there has answers for the following questions.   I'm shooting 9mm, 115 JHP, 4.1 to 4.4 grn TG, 1.120 to 1.150 COL, varies from 1911 to revolver.

Do you need a chrono for detection of a spike?

Are pressure spikes secondary ignition? 

What conditions exist when a spike occurs?

How do you know if a pressure spike occurs?

Does it manifest itself like an overpressure condition?

What should I be looking for if there is a spike on a particular round?

Thanks for any help understanding this phenomenon.

Guess it depends on your loads, many shooters use it with no issues at all in bullseye target loads. Average loads for 185  and 200 lswc is 3.9-4.4