^ You need to find a close circle of people who break raw down. That way you get the more personal batches meant for the person and their friends. If you look in the right places you will find high mic'd paper, dots, gels, liquid and other concoctions. The reason you commonly see a range of ultra low dosages (barely active) to ~100 ug so often is due to the price of raw. For most, the price of a single gur is more than most people vehicles. When the prices drop the dosages goes up.
OP-I doubt you took 142 ug. That number was most likely a random dosage thrown to you by the supplier. If they laid the paper they have a very good idea of the dosage but 142 is very random. LSD certainly has visuals but, dosage and quality of visuals will vary batch to batch and person to person. There are times when you can enter a melting rainbow fractal land starting around 150 ug (sometimes even around 120 ug). Others need much higher. 250-300 ug starts to really get things going. Another aspect is many users of LSD have no idea the dosage they are taking. Lot's of times people often think they are consuming a much higher dose then they are. . For example, when they think the paper they have is 100 ug its in reality 45ug. That is not to say there aren't people who are certain of the dosages they use. You can even read it through various trip reports these days. A 300 ug experience is pretty deep and easy to fully immerse yourself in the experience. With the LSD I always take I personally get good visuals starting at 120 ug.
Setting will play a big role. But, as the dosages increase the ability to "control" your visual field becomes impossible. Indoors visuals are more pronounced on lower dosages then outside. But, I find at 120 ug is when it really gets started and you stop being able to "ignore" the melting, morphing, dissolving etc.
If you are looking for a deeper experience you need to probably eat more LSD.