I'm also running the same type 55 IC and having the same intake air temp issue. At the start of my last run my intake air temp was 64* at the end of the pass intake temps were 101* outside air temp was about 68* here in MD. With my single rule 4000 GPH pump I checked my flow through my cooler all the way back to my tank and found I was only flowing about 17
GPM. Planned on adding a second pump to see if that would help but with was is being said here it looks like I need a better IC.