I would get a 5" angle grinder, the 4 1/2 I bought is just not strong enough. I used to think my welding was not that great too. Then I went around to various body shops to pic their brains about rear quarter installation. Anyway, some of the welding I saw out there was pretty rough. I couldn't believe it. So I bet your welding is just fine!
Adrien.
65 GT Coupe all dismantled waiting for resto.
67 Restomod Coupe all sheet metal done, next is assy.
69 Mach 1, SWMBO say don't you dare take it apart!
91 5.0 LX HB, daily driver.