T4 is not useless...
But, based on your dosage, it sounds like you were using liquid T4, which was probably very underdosed. Be careful if you switch to pharma T4 or you may end up having a bad experience with the same dosage.
Be especially careful with T3. T3 is approximately 4 times as potent as T4. Most T3 liquids are very underdosed.
If you have Pharma T3, start with 25 mcg and bump it up every 4-7 days, depending on how your body handles it. You really shouldn't need more than 100 mcg if everything else is in check. The fat should come off easily, especially if you are using GH and Clen.
BTW, when dieting I use two 65 mg Armour Thyroid per day and supplement it with extra T3 as needed. Each 65 mg Armour Thyroid contains 38 mcg levothyroxine (T4) and 9 mcg liothyronine (T3) for each 65 mg (1 Grain) of the labeled content of thyroid. That's the typical ratio.
Oh, and to compare...using two 65 mg Armour Thyroid per day is MUCH more effective than using 150mcg of AG Guys T3. That should tell you how underdosed their crap is...
Be prepared to sweat a lot, particularly at night.