The ic couplers are a good idea they can be a little bit of a pain fit as there tight but that's what you want. Less leaking more boooooooost :-)
Seafoam works to a degree,
best thing to do is make shore you flush out your ic every so often they get a lot off oil mist in them, just pop the ic off flush it will fuel or paraffin till it's clean then leave it to dry out for a bit.
If you have not already done it fit an oil separator / catch can this will help and is a good idea.
If you want a good injection / fuel system cleaner use bg44k.
Also my advice is if you are working in that area check your spark plugs are tight, they tend to loose torque and blow out worst case so always worth checking.
Have a good day make the most of the weather :-) I am outside playing with fiberglass making an air diverter :-) I think it's a 6 beer job though :-)
Hope this helps