Bill:
Many moons when fishing some dinky Pocono streams ago all I used for a leader was about 2 feet of 3X & about 3 feet 4X or 5x on the end of my fly line and sometimes just 4X. What Wildtrout2 is suggesting is an even better idea if you don't like tying Blood Knots.
The bottom line with short rods & short casts is IF you have a 7'6" foot leader and a long front taper fly line, it is conceivable that you would need to have a combination of at least 20+ feet of fly line & leader past the tip top guide just to be able to feel the rod load.
When the rod doesn't feel like it is loading that's when you can get into trouble and overpower the casts resulting in all sorts of problems. If you are fishing in tight quarters where a 20 foot cast is a long cast, it gets even worse.
THAT'S the reason why going with a heavier fly line is advocated by some when casting short because the heavier line suggested compensates for the fact that you are not into the belly of your lighter weight fly line.
However the reason for that is probably because you are fishing a longer leader than necessary when casting short distances and/or you fly line front taper is way too long for the job. Every foot you make your leader shorter and every foot shorter the front taper of your fly line is, the less line you will need in play to feel the rod load.
FWIW - My hands down favorite line is a SciAngler Mastery DT. On the 3wt version I use most often on my short rods the front taper is only 4.8" long. I also fish about a 5 foot long leader in tight quarters so it is conceivable it takes me almost half the amount of line & leader to feel the rod load. That & because my rods are fiberglass & bamboo, I never felt the need to over-line.
For leaders, I use 3' long furled leaders to which I add 2 - 3 feet of tippet. If you are buying regular tapered leaders that are knotted, you can probably lop off some of the heaviest two sections and shorten a 7'6" leader with almost no performance issues.
I do want to add that I exclusively use short rods for short casts on very small streams. I would NEVER use a 5'6" rod anywhere that I could comfortably fish something longer because longer rods do everything better except fit in tight places.
Good luck if you decide to give the short rod another go...