I disagree with your findings. I recently switched from Humalog to Novolog. I also tried this experiment 2 years ago and initially saw noi difference in the two insulins. This time i was monitoring with a Dexcom CGM and the results are conclusiove. Novolog for meand for my wife reduses the peaks after meals, allowing me to actually have flatliners readings relatively regularly. On another site the following summary is offered
Differences Between Humalog Versus Novolog
A couple of major differences are being reported by users between Novolog and Humalog. Especially among pumpers who switch from Humalog to Novolog, reports have surfaced that Novolog appears to be both stronger and quicker than Humalog, and doses have to be cut in order to prevent hypoglycemia. Dose reductions are often in the 10% range, and it may be wise to reduce doses right away to prevent unwanted lows. If, instead, blood sugars rise, doses can always be raised again.
Novolog also starts working faster than Humalog. Although no direct comparison of Novolog and Humalog has been reported, one research study found that in normal individuals, Novolog reaches peak activity at 52 minutes, compared to 145 minutes (2 hours and 25 minutes) for Regular insulin. Humalog peaks at about 75 minutes (Eur J Clin Pharmacol 1999 May;55(3):199-203). Both pumpers and injectors may note lower post-meal readings due to the faster onset of action.
The clearly defined action times of the fast insulin makes it easier to troubleshoot problems. For information on how to determine the number of carbs covered by each unit, see the 500 Rule in the Pocket Pancreas. Humalog and Novolog are also excellent for lowering high blood sugars with less time spent at high blood sugar levels, and less residual insulin left to trigger low blood sugars later. For information on how to safely lower highs, see the 1800 Rule, also in the Pocket Pancreas.
Another significant difference is that the Novolog is less sensitive to heat and has been approved for up to 6 days in a pump vs the 48 hours for the Humalog. I was having relatively regular high blood sugars at infusion pump change and have since tracked it to the short life of the Humalog. I do not see this issue with Novolog!!! I am completely convinced that Novolog is a far superior product for insulin pumpers. I now have some 40 vials of Humalog that I am looking to donate to some charity that can help someone in need. I wont use it myself anymore. I wish thatI discovered this years ago