Here's another option;
Tracker;Lowish rocker, and moderate volume. Easy to paddle, and catch waves with. Can duck dive.
Another option again, would be to go for a Custom Tracker, with harder, more modern rails.
Even have the option to add side biters.
I honestly think that you'll have the most fun on a Tracker, at say 7'2 to 8'0. 7'10/8'0 will feel quite friendly. Not a massive step down, compared to going from 9'1 to 6'10... A 7'10 tracker style board will also give you that nice glide you are used to, from a Longboard... (think fun midlength, not shortboard!)
Tracker v Tak Scorp - my thoughts...
Tracker templates will handle the juice far better than say a Tak Scorp. In a way, I think the Tak Scorp suits a short boarder, who wants a fun board, for weak waves. Steeper drops, juicier days... I would want The Tracker, not The Scorp... Just my thoughts.
Also look at the
Bobsled (McTavish). But be warned, the Quads are pretty loose, and love to be ridden hard... If you prefer more "trim & glide", then Singles, and Singles with Side Biters (1+2), is going to feel friendlier... Feel more familiar/similar to your Longboards with 1+2.
Here's my tracker insipred gun / semi-gun / longboard gun... 9'0...
An over sized tracker. Blue thing in the middle... Plus the shaper!