Here's the thing: the fewer levels you spend in Monk... the better your monk is.
Well, the most usefulness I can see getting out of monk is level 6. More than that and you really run into the realm of diminishing returns.
I'm not saying you can't make a monk better, but you're working uphill compared to classes. If you'd care to put up some monks that you've used, feel free to. I'd be interested in seeing how other people build them since I generally get out after level 2.
It's good that you have fun. Powerful or weak classes aren't inherently fun or not fun to play; a lot of it does depend on the setting. That being said, I tend to look at things from a mechanistic point of view when asked questions about classes so without further ado...I'm not making any claims about better or working uphill because that stuff doesn't matter to me at all. As long as I'm having fun and contributing to the party's successes, I don't care if I never have a single über moment in the campaign.
That said, I emphasize Dex/Wis/Con to maximize defenses and the other stuff I mentioned upthread. Feats typically emphasized are the Combat areflexes feat tree, with occasional ventures into the exotic, like Ring The Golden Bell.
When I use dex builds, I make sure the PC has a good ranged weapon or suite of weapons...a Quiver of Ehlonna is high on my wish list for such PCs. A crossbow for alpha strikes, javelins or grenades of some kind for continuing ranged work as you dance around the battlefield.
Oh yeah- and unlike the way some play their Str monks, don't succumb to the temptation to play the monk as a front-liner like Ftrs, Brbs and the like. You don't just stand there and trade blows, you stay mobile.