so first i want to address the modifications, you will notice when you are in the hideout and you go to the modification room it says your percent as a team..that means that while yours might be upgraded it helps that the team as a unit expands theirs as it will increase the stats of the mods you make. so that might be a good way to get a better one, on the other hand once you do hit a certain level they are mostly good for saying items for the con as the season ones are better....
also a rule of thumb i use with items in the season is wait until the end and collect all...they will be negative until u put the mods on and start switching them out, mine are always negative until i put them on...try that see how it goes and get back to me. the more you level up the better they will be.
thanks, i hope this helps a little