If you are very good at bleeding them you can often get them pretty good, but yes, can relate to the random biting point issue its VERY common with Elixir’s.
I would say let a shop try bleeding them, if they have no luck then get them sent away to Fishers/SRAM tech centre, if it doesn’t fall under a warranty issue (i.e. bladder ruptured etc) then AFAIK its about £25 inc return postage for them to bleed them.
However, if its slightly spongey lever issue, then thats pretty much what you get from those brakes, even when bled perfectly you can pull them to the bar much more easily than most, in which case only solution is to put them on ebay and buy some current gen Shimano Deores/SLX/XT