Not at all!
You don't realize how glad I am that you're dedicated enough to try and try and try until you get everything just right. I really appreciate it.
I'm actually the opposite. I'm afraid to give comments on certain things because I'm afraid the person just won't understand that I'm not doing it to tear down their hard work, but to actually help them so that they won't have to through the same path I followed.
I'm currently rescanning some magazines for the 3rd time in less then 2 years because I'm not satisfied with my own work and I'm certain I can do a better job now after all the mistakes I made and learned from in the past.
This latest scan looks leagues better than the previous ones BTW.
I would keep saving your JPG's in GIMP at 100%.
1MB for a 1440 JPG images is certainly not too big and it looks great.
Another neat little trick that I can show you is the following.
Try this out:
You might notice that on your screen, the picture looks not as vibrant as the magazine itself.
Washed out might be too strong a word, but you might notice that there is a sparkle missing which is there in the original mag.
This is most apparent in bright colors, like in screenshots, titles or artwork.
I know because my scanner does the same thing.
Load your image in GIMP and go to colors, go to Hue-Saturation and up the saturation by 20.
Click OK and save the page as gamefan3scaled2.jpg or something.
(You might have to save the page at 90% now as that might be the quality the images was loaded at by not coming from the scanner. You can check by seeing if the size is almost identical)
Now compare the 2 images by going quickly from the original to the new one and back again, over and over again.
(you can make a cbz of the 2 pages if that makes it easier to display them at full resolution on the screen)
See the difference?
It's like there's a deeper layer of depth to your scan now.