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My 2cents (or less) worth
I believe the biggest change was aluminizing the screen, as the aluminum layer reduced the ion impact on the screen. This may not have been 100% effective, but it helped a lot. Ion trap use started to diminish when aluminized screens became prominent.
Other improvements to reduce the number of ions include:
1. Getter improvement from SAES and other suppliers.
2. Funnel flashed (rather then neck flashed) getters to provide more surface area of the getter flash.
3. Pump cycle improvements, improved diffusion pump "oils".
4. Improved RF processing (Bombing) while the crts are being pumped.
5. Improved raw materials/cleaning methods.
jr
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