Actually unfortunately it is actually very hard to make that happen. The last Homunculus loyalty boost event was to make up for the update that had severely altered the balance of homunculi and many users had to restart. Since homunculus loyalty can only be altered through time-consuming direct editing to the database we have asked for kRO to work on developing a battle manual for homunculus intimacy and exp.
But Oda if ever iRO will have these manuals for intimacy and exp, that would be awesome... Hopefully kRO will develop this.