Actually what about instead of one task force type, we would have three:
CV Battle Group - Consists of an Essex-class carrier, a cruiser, and destroyers as we have now. Would have the same aircraft as currently available, but NO LVTs or PT boats.
Bombardment Group - Consists of a battleship, cruiser and destroyers. LVTs can spawn from this task force.
Light Carrier Group - Consists of a CVL or CVE, with destroyers. Can spawn LVTs. Aircraft would include lighter CV fighters and bombers.
IMO I don't think any task force should spawn PTs. AFAIK, PTs weren't transported in this manner.