If it were me, I would think seriously about doing it now for a few reasons. One - you're asymptomatic now... but what about in the near future? Two - you're strong now... but if you wait, you might be weaker and then have a tougher time with the chemo. Three - if you have a shot at kicking the cancer's but, then I say, take it!
On the other hand, chemo is not easy and has side effects...
This trial - is it a clinical trial?
I feel like you should have a comprehensive understanding of the pros and cons of choosing to or not to do this treatment plan....
A final reason I would think about a clinical trial is the possibility of making it better for other people in the future... and the possibility that you'd be getting the magic bullet that does kick this cancer's butt.