Read the questions on the forms carefully, and answer truthfully and completely. Don’t add anything else, it is not necessary for completing the forms.
Don’t be so sure about arrests not being on your record. Again, disclose whatever information is asked for in the questions.
You’ve already been through this once for the secret clearance, and it should be a similar experience for a TS. If these issues came up during that investigation, they’ll likely come up again. Based on your answers to the current SF-86/eQIP and the previous SF-86 (which the investigator should be able to access) the investigator may want to ask some more questions about the issues you have described. At that time you can go into all the details. But I would not advise voluntarily disclosing any information beyond what is asked for by the questionnaire.