PPC Suggested Bid

New seller here. I’m having a bit of confusion on my end. For PPC suggested bids, im noticing some of the keywords im targeting have relatively low suggested bids (0.66-0.88) under the down only strategy. Once swapped to up and down, it’s about the bids dramatically increase (3.25-5.29).

For the down only strategy, I place my bid at $1 with the 0.88 suggested bid, but, impressions are maybe 1-2 every 20 minutes, or none at all.

What is with this discrepancy and how do I go about altering bids. I want to stay within the down only, but, nothing happens to where I just pump the bid way way higher and then it starts to slowly move a bit more.

Or would fixed bids be better?

Any help with this or explanation would be great.