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I am primarily a keelboat racer but thoroughly enjoy racing Flying Scots.  With respect to the Scot, a flat boat is a fast boat so these depowering recommendations will also help you even though we use them for racing.
First if you have older sails they may be harder to depower because a baggy sail holds a lot of power in the breeze.  Not suggesting that you must have crispy new racing sails but the adjustments below won’t as be effective the older the sail.
“I move the jib sheet blocks back” – Moving the fairleads all the way back will flatten the bottom of the jib and open the top leech which depowers the jib.  The sail area of the jib is small compared to the main so this adjustment alone would be hard to detect which is why you might not notice it.
Jib Halyard Tension – If you see scallops in the luff of the jib increase your jib halyard tension until they disappear.  This will also help depower the sail.
Cunningham – If possible rig a cunningham it will help move the draft of the main sail aft which is especially helpful if you have older sails.
Main Halyard Tension – Make sure you have a full hoist with a significant amount of main halyard tension, especially if you are unable to rig a cunningham.
“I’d love to hear thoughts on the vang” – Upwind with the vang on hard, it will flatten the main sail significantly depowering it, but without a cunningham to move the draft aft the effectiveness will be diminished.  Off the wind you would leave cunningham on and ease the vang so the boom may rise and provide the twist to open the top leech of the main sail depowering it.  It is not a static adjustment, vang on upwind depowers, vang on downwind powers up the sail so it must be eased.
“I crank on the outhaul as much as I can” – This flattens the foot of the sail depowering it but without cunningham and vang it is not as effective.
Centerboard – “Reefing from the bottom up” was a foreign concept to me when I started sailing a Scot, but it works.  Raising the centerboard decreases the lift it provides and it will noticeably flatten the boat.  Upwind you will slip and not point very well (ask any racer who forgot to put down their board at a leeward mark rounding). Depending on how breezy it is and how far you bring up the board, you may find it difficult to tack.  This is something you should practice to get a feel for.
Mast Rake – I recommend setting your rig to the specs your sailmaker recommends and leaving them there.
Hope this is helpful and interested to hear how it works out for you!  

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