You men my Ambhib TF's? I'm presently planning to leave them off the beaches to provide their level 2 port capability. Is that best?
Those TF's have naval guns, and are your BEST weapon in the game because of the suppression/disruption those guns can cause along the coast.
DURING the turn you can park them adjacent to a battle and they'll lend their support. I've found it integral to quickly reducing Axis coastal forts.
At the END of your turn don't have them parked adjacent to an enemy port because they'll suffer fire from coastal guns (the higher the fort level in the port hex the more damage they can do). Keep this in mind when planning invasion sites as well. They will also fire at enemy units that are adjacent between turns, and a single TF can support multiple adjacent temporary ports, so you should have a few 'free' at the end of the turn to place as you desire.
At the END of your turn either have them supporting your temp ports, adjacent to a damaged lvl 1 or 2 port (they will fully repair it in a single turn - this frees up engineers for other tasks and can make temp ports less important more quickly), or in one of your ports with a unit prepping for the next invasion.
You can be prepping for invasion in Tunis, sally out to Messina to lend some 6" gunfire, then go back to port and continue building prep points.
In all the AARs I see WA forces struggling I don't see them making effective use of these units. People are taking months to clear areas that can be taken in weeks.
Time is not on the Allied players side. You have to learn how to use your Air Force and Navy to go toe to toe with the Germans on the ground.
"War is never a technical problem only, and if in pursuing technical solutions you neglect the psychological and the political, then the best technical solutions will be worthless." - Hermann Balck