See Mike Sherman's gear calculator.
Here's a link with your 11-28 cassette and 53,50,and 34 chainrings. You can compare 50 and 53 here. (Ignore the 'bookmark this page' popup--just click OK, it doesn't actually save it)
The 50 to 53 difference is about 1 mph for any given cog. See the
Speed over RPM chart near the middle, with the 53 chainring speeds in blue and 50 chainring in black. You can change any setting, and the charts update on the fly.
The 50 tooth chainring has slightly closer gear speed changes from 15 mph to the low 20s. So that would probably work well for you.
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I run much lower gears, 50/34 chainrings and 13-29 cogs. But I don't really miss the 50-12 or 50-11 combinations. I just coast downhill if the speeds are over 33-35 mph.
I'll even use the lowest 34-29 on a 5% grade, spinning at 90-95 rpm.
I use the cadence reading on my bike computer a lot (more than I expected!), mainly to remind me to stay in the mid-90s if possible. It's easy for me to drift down into the low 80s if I'm not paying attention. If I'm doing a easy cruise, then I'll stay in the low 80s, since I'm hardly pushing the pedals.
I don't do "that" much flat road riding. There's usually at least a small grade. So I'm always shifting gears, even for a short change of grade, just a few pedal revolutions.
Good chainring and cog selection depends on what typical flat road speeds you hit, and what cadence you like. I like small gear speed differences at my cruising speeds, so I can shift into the exact cadence I want.
When you need a replacement cassette, maybe you should try a
12-27 cassette, instead of the 11-28. You would add the
16 cog. At 90 rpm, that cog is 21.9 mph on a 50 chainring, or 23.3 mph on a 53 chainring. You'd only lose some top end speed in the mid to upper 30s. (You can add the 16 cog to the Gear Calculator, showing 11 gears, to see how it might help. Add it to the end of the list, it'll be inserted in the correct spot.)
That's pretty typical for climbing. I'm often in the 70-80 rpm range, and have gone down to 32 rpm (about 1 pedal stroke per second) on very steep hills. Most riders don't have low enough gears to do 90+ rpm on real grades.