In regards to modifiers and pricing I would personally have it more like it is in the books. If you read the section on trading in the core books starting at 162 in aor but mostly 164 and 165 with particular interest in tables 5.2 and 5.3... you have a civilized, colony or inner rim world at 0 modifier then a core world is -2 And an uncivilized world is +4. So a plus 4 modifier is 4× the book price. Now technically those are the trading rules so I wouldn' follow that precisely for actual normal character buying of items. Maybe have core to colony be book price and do 1/4 increase per modifier for the rest. So uncivilized would be 2 times rather than 4 times. But I would use it for availability for sure.
Or maybe have the base price in your shop generator and have an option for putting in the gms own modifier value.
Although the images are a part of the problem for readability they are not the only issue. Some of the fields have too much info in them for ease of viewing.
Anyway thanks for listening and love the generator in any case.