It looks like I will get the 1/8" then some hot glue...
Brax,better be right about this.
Of course I'm right! I'm
ME!!

(Obligatory Snaaake rolly eyes)
I can give you good advice because I'm a bigger person than you!!

If you're worried, grab a piece of scrap 5/8 and a chunk of t-molding and try it out. The hot glue fills up the whole slot. I would bet it's actually stronger with the hot glue than a 1/16" slot with none. When you apply your glue don't add more than about a foot at a time. Do a foot, press down your T-molding, hold it for a few seconds (especially on curves) then lift it up to add another foot of glue.... (don't worry about getting
right beside the last batch of glue. The tongue of the t-molding prevents you from getting right beside it. As long as you start your glue an inch away from the last batch, it'll be fine.
Once you're done, it'll look amazing! .......and be strong! Even for adolecents! (Boy this is fun teasing Snaake!) hehe
.......and when you're done all you have to say is
I was right and
you were wrong for doubting me! ha!