Ya. if u r not getting aa exp with the 86 and its within your lv for xp spread, there could be a few things.
one.. u might be ftp. which allows u a max of 250 aas before u can no longer get xp.
two... you are silver which will allow u a max of 1000 aas before it will block further advancement in aas.
keeping in mind that spread sheet above. its your lv x 1.5 max level difference between toons for xp. ( max of 30 levels )
If you are subbed, There should be no issues with xp but as Sic already said, if u r subbed, let the auto grant do its job. work on reg xp. there r options for fast aa work down the road. example might be running a lv 100-110 in vex thall in a group with 120's . I got 4-5 aas per kill. that does disappear at 111 tho, so use it with that in mind. I capped my 240 aas, spent a ton on things, capped again. the toon got probably over 1k aas in a few hours. I probably dont kill quite as fast as these guys tho heh.
LoD.. this is your friend but it still follows traditional XP rules. example being, if u r getting 4+ aas/ kill. don't burn LoD lol. i did this. it went up to 5.. so was a complete waste of time lol. It will, however, work for reg xp quite nicely, like always.
Ohh. ya, forgot about that grey to higher lv toon thing for powerlevelling aas. Redmonkey = right. Look for something your higher lv toon can swarm. it will be slightly lower aas/kill overall but significantly faster overall xp.
There are tons of tricks to this for powerlevelling. I like using clerics shining line on the guy doing the swarming. keeps them nicely healed. tons of other options available too. like nice DS
( If im using DS, i pull mobs that dont summon. less chance of a whoops occurring
Best of Luck, hope you figure it out.