AWeber ignores Advanced Excerpt instructions in RSS feed

I’m trying to setup an AWeber based newsletter campaign

AWeber uses the descrption tag to generate the post excerpt.

But it is truncating the exceprt at 100 characters, from the look of the code below that they are using.

How can I change this markup to either accept the settings in Advanced Excerpt or to replace the code so it will finish at the end of the sentence?

Current code:

{% if entry.title %}{% if entry.link %}{{ entry.title }}

{{ entry.link }}
{% else %}{{ entry.title }}{% endif %}{% endif %}

{{ entry.link }}

                                                        {% if entry.enclosures | length > 0 %}

{% endif %}
{% if entry.description %}{{ entry.description | truncate(100, False, “…”) }}{% endif %}

                                                    {{ '</td>' }}
                                                {{ '</tr>' }}
                                            {{ '</table>' }}
                                        {{ '</div>' }}
                                    {{ '</td>' }}
                                {{ '</tr>' }}
                            {{ '</table>' }}
                        {% endfor %}

Thanks,

Chris