I'm definitely no expert as I have a total of 5 days on WI. However, the first 2 days were last year and the last 3 days were a few weeks ago. Ouray has done wonders for my technique for sure. Last year, I topped out on 3 total 30m routes in the ice park. This year, I topped out on 14 of 17 attemps on all different routes from 25m to 30m. This is all top-roping. A few of these attempts were outside the park. Anyhow, what I find is that the park really helps me work on the skillz.
The big change for me? (you won't like this). Climbing gym. I diligently did 1 strength training and 1 2-4 hour session of top roping in the climbing gym for about 2-3 months and my performance improved so much that I'm stoked for next year (and any time in between that I can get on the ice). I can place screws but nowhere ready for leading routes this year (next year I bet I will finally lead a route).
Anyhow, that improvement was about training (yes, I know). I have ok tools and ok equipment - but I got a lot of climbing in and now know pretty comfortably where my strengths and weaknesses are on the ice.
Where are you located? Where are you bouldering ice? I'd love to get some practice too... I'm scheduled to go check out the ice with Martin Volken out of north bend up at Alpental, but it keeps getting rescheduled because there aint no ice.
So, there's the advice. The only other cramponing practice I could suggest? GLACIERS. Yep, you could toprope a crevasse or even get up on Rainier and find some good steep slopes. Not the same, but might help your technique.
Anyhoo... I'm not an expert and still just learning the sport, but I feel your pain. Where's the ice?!?!?!? Good luck on your cramponing practice.