AF Swifts and good light

with little on offer to photograph of late I took advantage of some nice light on Friday afternoon to have a go at some feeding Swifts---the birds were moving very fast and often in all sorts of directions with little stalling so it was a real test of the camera equipment (and my handling ability) to get them in the frame and sharp and with a decent pose (the latter often a matter of luck)---exposure was about 4000th second at f4 at ISO 320 on the Canon 1DIIN and Canon 300 2.8 lens---I use the Image Stabiliser on mode 2 and the settings on manual exposure, A1 Servo and 45 AF points---Swifts are always a challenge but a few results were pleasing; I particularly liked the shot with the insect above the Swift in the next frame it had already been caught and eaten so fast was the action