recombinator sucks ass, drop off should be linear and make it ranked choice not all or nothing

It should guarantee at least 2 high tier recombination to be worth it. So much time farming and filtering for items and you can't even combine to get two mods you want (<10%). It feels like the drop off is exponential but should be more linear. Example for all tier1 mods

2 mods: 65%
3 mods: 50%
4 mods: 35%
5 mods: 20%
6 mods: 5%


and +1% for each lower tier, tier9 ex:

2 mods: 73%
3 mods: 58%
4 mods: 42%
5 mods: 28%
6 mods: 13%

Also, it would be better to have it ranked instead of all or nothing. That is, if you want to say roll 4 mods and if that fails, it should roll for 3, then 2, etc. Letting the user ranked which mods they want in order of importance. This would make the system much better to use.