Pickup needed

Hi to all,

My current ride is a DOHC 4G15 auto, and my pickup sucks big time. How do I improve on my pickup?
Current setup:-
Unichip Gold
4-2-1 extractor 2" w/semi flow muffler
Blitz sus open pod filter w/heatshield & CAI
65mm throttle body
15" lightweight rim
VRM front brakes and calipers

Should I skim my engine head for higher compression?
Should I go for Port & Polish?
Should I fit in a adj cam spocket?
Is there any different in performance of a drop in filter and a open pod filter?

Please advise.