Well as much as a feel sorry for yam.. no ammount of pity will get this weak iron civ to survive in iron vs the mighty hittite iron machine. Hittite's cats w/HA back up will roll over yam like a knife thru butter on a 120 degree day. Yam will have trouble w/hitt scythe, if hitt goes that way or raids him with a few. It is nice to think, yam's Hcav and cents can deal w/hitt's iron machine but it ain't going to happen.
yam need to nail hitt in tool w/slinger and scouts) clearly yam must hurt hitt bad by early bronze or it is time to suffer.
At sea Yam has a great navy, but hitt's 13 range galley w/FG's will compete quite well.
Re: yam jug's, he'll be dead before he can afford that expensive upgrade, and 75 gold per cat tri or jug is a lot for a very gold dependent civ to spend !
1v1 yam may damage hitt in tool and win w/early bronze rush.. but in iron yam needs to get there clearly first and with a much better econ to hav ea prayer vs hitt.
In tool, please note, that Hitt has no slingers and can be hurt badly by a slinger rush.
If both civs are ironed with decent economies, the yammie might as well get his will made out !! .. neilkaz ..