You wont get stable 72 fps with a Quest 3 at 1.4 pd, MSAA enabled with a 4070, i get 72 fps stables with around that resolution, with DLSS on a 4090, so you can get an idea giving a 4090 can double the performance of a 4070 at high resolution
Have you tried ASW always enabled instead of disable? i never got good results with ASW disabled unless i achieve the target FPS