I too use more than one type of call
a mouth call is great to learn, cause it give you free use of both hands, and cuts down on movement
and I personally think its movement that is the main killer in getting busted by a turkey, dam they have super eye sight and can pick you off moving from way out there too
I also come from the school of less calling is best too
and last
spring time birds are a LOT more willing to come to a call Imo than fall birds
so spring time calling is the way to kill em
over maybe in fall, of wanting to bust up a flock, and then call them
in spring time, busting up a flock, doesn''''t seem to work as well as in fall
just puts them on edge I think

another good tip is to try to roost birds in the evening before a hunt
gobblers in spring time many time gobble as or just before going to roost for the night
then you can try to pin point where they are at, and sneak in in the dark ,and try to get about a 100 yrds from them or so
just be aware, many times they roost with gens, so be quiet going in and setting up, come first light the gobbler might be a 100 yrds away, but might have hens all closer to you
then use them as live decoys, try calling to them, to get that gobbler to come your way as they all start talking