Mod drop rate

Exactly. I'm the same. Former Big whale with my wallet closed. They don't seem to care at all. Otherwise they'd listen to the thousands who've posted the same thing.

Mods are a pure and simple lame scam.
They have an abysmal drop rate and when you see one drop it has a good chance to not be at maximum level from the challenge. If you manage to get a tier 5 Mod then most likely it will be grey, or it will be a left slots Mods or will come up with a useless primary stats. Personally, I have not seen more than 1 Mod worth leveling in a month, spending all cantina energy and 2 refills every day. There was an open window of a week for those spending a massive amount of money to acquire tons of good Mods and that window has been closed with a nerf bat before medium spenders and f2p could enjoy the 100% drop rate of t5 Mods only.
I also think the Mod shipment is insulting customers intelligence when it frequently offers the hardest Mods to obtain ( right slots ones ) with good primary stats at extortionate price. I am glad for CG/EA if they manage to obtain money from obsessed or simple minded people with their commercial practices. I am not convinced this sort of practices and game design either wins in the long run in terms of revenue and reputation.