I don’t think you should have to use any more power to play your chrome than your diatonic however you have to make a few adjustments to your playing. Attempting to play a chromatic harmonica with the same approach as the diatonic is going to give you problems. Changing over can be challenging. Diatonic player are always thinking about bending and changing resonance within the mouth to make the harmonica sound more expressive. If you try this on a chrome you can choke the reeds or get a real thin sound…
On the 64 the first 5 holes especially the 2nd and the 4th give a lot of beginners problems. I know I am a beginner. It is always better to start out playing on the upper 12 holes and getting them to sound good and full of tone. I would try to open everything up in your mouth and go through the blow and draw notes hitting them straight on while all along taking mental notes as to how you are holding your mouth when you get that good rich tone you are aiming for. Play your major scale doing this and in no time you will find the sweet spot. Then go down to the lower register and do the same. Take it slow and observe what you and the harp are doing.
The wind savers will get condensation on them if the harmonica is cold and if not dried out correctly before putting it away in it’s case can cause sticky valves. They usually loosen up by warming it up and playing. They will rattle a bit you just have to be patient - I hate when the chrome does this. If I notice my mouth was a little wet while playing I partially open the slider and put a toothpick between the holes to let the whole harp dry out inside and out. This really helps!
If all else fails take it apart and inspect it. If the top clear part of the valve is sticking to the bottom you can seperate them by using a razor blade or exacto knife up the end of the clear part. Don’t forget to hold the end of the longer part of the valve as you can lift them up too far rendering them almost useless. There are ways to fix this if it happens
Doug Tate has a great book out called “Make Your Harmonica Work Better” which is crazy good and has some very advanced mods you can perform on your harmonica to make it better but the easy ones are equally as good. Trouble shoot it and try and fix it if you can.
Steve and Gabbi, have some fantastic videos out there on repair as well. Thes videos are priceless! Very well made.
Good luck Pal and let us know how it turns out.