Hello Macrogrl, welcome to the Forum!
There's lots of macro shooters here, and this is a thread you might enjoy;
https://www.pentaxforums.com/forums/lens-clubs/129563-macro-lens-club.html
Not only are there some fine photos, but you get to see a wide selection of different lenses at work.
I think the K-5 would be a good choice. I use a K10D and K-7 for macro, but regardless of the body, have found that switching to a split-prism focusing screen was the most helpful upgrade. Even with an auto-focus lens, many times I have to manually tweak the final focus a bit, to get things just right.
Also, a magnifying eyepiece (the Seagull version is pretty good, about $40.00-$50.00) helps in some tricky situations.
What len(ses) are you using?
Ron