RE: 2nd board?
Plenty of blasting speed, if that is your thing - but still easy riding/jibing in chop. Can still be quite playful in chop, medium swell. ST93 is not a technically demanding board to ride, especially in medium powered conditions, and it doesn't sail "small" for it's size.
HS111 : 8,5m and light 6.4m conditions
ST93 : Powered 6.4m and 5.4m conditions.
With 72kg, that would be sweet.
Agree with PG , if the resale on HS111 is not so high, use it for the second end to a good rangy two board quiver.
Cheers ~ Ian