As a man, a father and a single RP with full child arrangements order to 2 dds the same age as yours.
If I was in your shoes mate, being me and what I've experienced looking after the emotional well-being of my dds day in day out, with the tears and heartache it has caused them.
Take a good look at your own behaviours, think, if the same was being done to you as a kid how would you feel?
You may not have been the greatest father when you were all together, but you can be now, by putting the needs of your dds first, their emotional needs, not toys,sugar and party fun. But their actually emotional needs
Think about how the things they are experiencing will affect them later in life.
The support they will need to help them through the next few years, which are really really tough ones for girls. How will you handle it when one starts to self harm because her non resident parent is seeing someone. If the other one develops an eating disorders because the non resident parent focuses more on the older child than the younger one. And both have to deal with toxic parenting statements from the non resident parent said during contact.
The thing is as well, they have NO CHOICE, in this, during contact time you can force your own whims on them because that's what you want. What they want us quality caring time in the few hours that you are all together. Your focus needs to be only on them, no one else, only them.
You may not have deliberately set out to do anything, but when a decision point occured you made a choice.
From now on I suggest all your choices be for the current and future well-being of of your dds. It's only a maximum of 10 years until your youngest is an adult, perhaps you could do some deffered gratification and put stuff off until then.