I've used very thick picks for years when playing gypsy jazz (3,5 to 4 mm in different materials, Wegen plastic or tortoise shell in fact). But the more it goes, and the thinner the pick I use. Lately I've been successfully using picks that are 2mm or even 1,5 mm thick. In fact, it's after seeing a Bireli Lagrene concert and noticing that he got his perfect tone out od his Dupont with a very simple Dunlop tortex 1,5 mm thick pick (the one that has a light purple color) that the idea came to me. So I've tried it and the same one in 2mm thickness and after some adjustments I noticed it works just as well. You can get a very nice tone out of them.
Also one important aspect I noticed is that when using thin picks it makes you work harder on the right hand technique as it has to compensate for the natural power and fat tone you usually have with a very thick pick. But the right hand technique can be adapted in such a way that you get just about the same effect or very close (great power and pretty fat tone, not too bright sounding). So I even found it a good way to work on a better thechnique to use such picks for a long while as when you switch back to thick picks you really get a monstruous tone...
Do some of you use fairly thin picks (or even the Dunlop Tortex ones I mention) ? Why or why not ? What's your experience whith thinner picks and how did this affect your right hand technique (if it did) ?
Thanks in advance for any input on the subject.