Your perception about small claims court is probably correct. Regardless of the court in which you sue, the value of your case comes down to quantifiable damages which you can prove with admissible evidence. In a typical constructive eviction case, the damages would include actual moving costs and the higher rent you now have to pay to rent a comparable property. Also, most constructive eviction claims are alleged in a cross-complaint when the landlord sues the tenant for breach of lease, so I am not sure why you want to sue the former landlord unless the former landlord is already suing you.
Damages on nuisance or quiet enjoyment would be measured by your emotional distress, beyond the statutory damages. If you were seriously emotionally racked -- unable to work, seeking psych help, etc., that would go further than just being pissed off. However, the court would probably look at factors such as the egregiousness of the violations, repetition of the incidents, disregard for your attempts to resolve the situation.
Harrassing someone to move out is a serious matter. You are right about small claims judges and you should get a full evaluation based on the facts of your case as to whether there is an attorney who would take the case on as a full civil case. You would have to convince an attorney that there was evidence of serious misbehavior and not just "strong words" being thrown about.