A few things that brought my shot count over 40+:
SSC or ASP fluted hammer paired with Red main spring and stock valve spring
SSC Bobbed valve (gauge was a bonus)
Bore matching with freak inserts. (another option from SSC) Freak inserts, Ifit or anything that matches paint size to your barrel will keep you from wasting paint
I do play in happy for 12ies hawaii but the count started on my phantom at give or take 30.
I tried the ASP TPC mod. I found that the fragile paint I use, (Evil, Anarchy and RP Premium) tend to dislike the mod and explode in my barrel. You may find it working but have a backup standard TPC just in case.