[bairdmotorcycles]

Looking for a little advise and I cant seem to find any help with other posts. I am polishing a aluminum motorcycle frame and have the desired finish already on the tubular front portion of the frame but I can not seem to match the finish on the cast area around the foot pegs from the weld on back despite using the same process. The front is absolutely a mirror and I have only hit it up to the spiral/brown combination. The cast area, tho shiny, is not achieving the same finish as the other section separated by a weld. I started the cast process with 80 grit, then 220 grit, 400 grit, 800 grit with a DA sander, to wet sanding by 800 and then 1200 on the cast section and started with 220 on the tube section. I don't think the prep is the problem as I don't have any scratches or pits/waves etc but I am not sure. Could the jump between 80 grit and 220 be to large? But after 1200 the cast section of the frame looks just as good as the tube section. I have done other pieces to mirrored finishes with aluminum but this is giving me fits. This is the first time however I am not using the 3/4 polishing machine I purchased on Caswell because I don't feel like holding a 70 lb frame all day. I have been using a 1 7/8 electric polisher/buffer which gave me a brilliant shine on the tube section. Right after sanding I went directly to the spiral/brown (tripoli) and then the loose/white combo. The tube section is perfect but the cast section is hazy when closer then 3 or 4 feet after hitting both with loose/white. I then re-sanded from 400 up to 1200 wet and have now tried several different combos of loose with black magic rouge, aluminum high luster a-14 and a-15, blue rouge on the cast section and can not get the same mirrored shine. I have even tried the 4 inch wheel rather than 8 inch I have been using, as well as switching to a 7 inch air angle sander with 4500 rpm and a die grinder with 20,000 rpm which both bog down if too much pressure is applied and I still get haze. The cast part also seems to be pitting or becoming even less smooth with the tripoli/spiral wheel. I have cut and colored in every way or angle imaginable but still no change. I clean the stages with mothers aluminum billet polish and use separate rakes not to contaminate the next stage. So what do you think? Prep problem with the cast compared to the tube which was already pretty smooth? To much/little pressure? To slow/fast of speeds for the cast area? Why would the cast have a completely different shine than the tubular section when using the same exact process? Can I get the cast area to the same brilliant shine? Any help would be greatly appreciated!!