Coming back to the shogun, the LRM-15's still make no real sense. In all honesty it would be better off losing the ERPPC and downgrading the 15's to 10's to add in a Large Laser or two and a few Medium Pulse Lasers. And maybe an extra heatsink or two. As it is its not even a good fire support platform, I would rather have an Awesome 8R or T in stead as they are effective bombard units and do not suffer from the major heat issues of the Shogun.
It is a jumping
Stalker...use it as such. While the ER PPC model doesn't make much sense, the standard PPC model works perfectly well at this...you get a little warm when firing both LRM's and the PPC, or the SRM's and PPC, so you drop one for the round afterwards. Your pattern would be 3 weapons, then 2 weapons, then 3 weapons, then...and so on...
If you jump, your modifier is likely high, so just use the PPC, unless you have a good enough chance with the missiles...
Ruger