There is no such thing as a pad that offers "Comfort" especially with a saddle that already fits properly. By you adding a 1/2 pad such as the Cavalo *and yes, I owned this very pad until I sold it* you will be making your already properly fitting saddle, snugger on your horse.
Just like putting layers of socs on and then putting your shoes on.
All these 1/2 pads that you see on the market today, are advertised to sucker people in to buy them and waste their money.
The only time you want to get a 1/2 pad, is to add more horse to a saddle that is too wide.
By you adding xtra padding under your saddle, you are creating more issues for your horses back than good.
NOW - on that note, if you were to use a 1/2 pad and only a 1/2 pad without another pad under it, fine - but be careful to not add too much bulk.
IF you want to add padding to relieve your horses withers, get a sheepskin pommel pad:
I wouldn't be adding more bulkage under your already properly fitted saddle.