Hi Bruce
First, yes, international rates went up a lot. Things are broken now 1-8 ounces is one price (somewhere in the $12 range) and then 9 ounces up to 2 pounds is the next rate and that is where you are seeing the $20+ range. These went into effect on January 17th, however Etsy did start warning buyers about this in October. If you don't have Etsy notifications turned on to receive by email, you should do that. Also visit the forums regularly to see information like this.
Now as to the large items you set up for calculated shipping, what you are talking about are oversized boxes - this will incur a balloon rate and it can get quite costly. 12x12x12 is the limit for regular prices - or anything adding up to that. For instance 14x12x10 or 16x10x10, something like that.
What you can do to check your shipping prices is use the Etsy price your postage calculator.
https://www.etsy.com/shipping/us/price-your-postageThat will give you the actual postage prices for Parcel Select ground and Priority and both Retail postage prices and Etsy shipping label prices. Etsy will automatically charge the balloon rate prices.
If you check on the USPS site you must select Oversized box which will then require you to input the dimensions of the box as well as the weight so you get the proper price. You cannot just go by weight with that size box. USPS will only tell you the Retail price.
Also, you are adding on $10 profile fee (this will go onto each item) + $1 box fee (only goes on once per box) so an additional $11 to postage. That is a lot. You may want to increase your actual item price rather than adding on so much to postage that is already going to be extremely high.
And as always, depending on the distance your item is going is going to greatly impact the cost of postage.
I hope that answers your question. But if you have further questions please ask.