If your gym has a Smith Machine, use that to lift heavier if you can't find a spotter. On the free bench, just take your time and know when it's time to rack it back. If 155 was a struggle, stay there until it feels comfortable.
Only time I used a spotter was when I wanted to find my 1RM. I'm 170 and rep 225 for 8-10 without a spotter. But Smith Machine helped me try heavier weight to see where I was at. I also love DB Press and believe it helps increase your barbell press significantly.
yeah im trying to get to your level. I'm 172 right now but cant do no 225. trying to slowly work my way up there. i know i can do the 165 tomorrow if i take my time and control my breathing. but yeah, i'll check out the smith machine. thought it would make the lifts easier but don't matter if it helps. i was thinking of on the squat rack also but remembered that it has removable metal bars and not stable ones that look like they can hold so much weight.