I use dried methi leaf in Madras. Like Secret Santa I grind the dried leaves in a spice grinder, although I add it (1/4 lev tps to 450 ml base) with the spices at the frying stage. I cant say whether the taste would be stronger if added later, but I suspect it would! I can say 'though, if I forget to use it, the result is obvious when it comes to eating.
For Bhuna and Bombay Spud, I tend to use the unground dried leaf a few seconds after the base has gone in.