Yes, breeding them together would give you pastel 100% het genetic stripes.
The 50% or 66% you sometimes see is the outcome of breeding a het or hets together. For example when you breed your G-stripe hets together every baby that does not visually show g-stripe will be a 66% het g-stripe until breeding proves otherwise.
Here is what you would get from breeding your Pastel Het G-stripes together:
6.25% Super Pastel, Genetic Stripe
12.5% Super Pastel, Het Genetic Stripe
6.25% Super Pastel
12.5% Pastel, Genetic Stripe
25% Pastel, Het Genetic Stripe
12.5% Pastel
6.25% Genetic Stripe
12.5% Het Genetic Stripe
6.25% Normal
This site is great for calculating breeding outcomes:
http://www.owalreptiles.com/genetics.php
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