Hi!
Thank you for your kind words!
1. It looks like it is a bug within the recent release. Can you please try switching to one of the legacy scripts, it should temporarily fix the problem.
2. Well, the item sizes adopt to the width of the container, as well as the column count. You could try a custom CSS code to force specific size to the elements:
.asp_isotopic_item {
width: 300px !important;
height: 200px !important;
}However this may not play well with the isotope script, the columns may break line etc..
3. Try the auto-populate feature.
4. It depends on the exact layout. Can you please send a link to the page where the setup is visible, I might be able to suggest some custom CSS code.
5. Theoretically everything is possible, however I am not sure how complicated this would be. You can make changes to the filters layout via the filters templating feature. However I only recommend experimenting with that, if you have enough spare time and experience with coding.