Doesnt true ai 1.4 address ai tyre wear? im sure it does....
As for the pit bug, the force indias have that bug not sure if the patch fixed it, but with other teams it can be avoided by pitting a lap earlier as ai are programmed to use the full wear estimate of tyres, for example in a 75% race primes last for 18 laps in my game, I pit at 16 and 9 for softs with a 11 limit, this way I only ever see 1-2 ai with me and sometimes i pit on my own and pass them the following lap.