Chris, to help, if you have a few frames, stack them with NO allowance for shift, ie stacked on one another, this will show the general drift.
Guiding wih a side by side/ extra scope, needs all of the following.
1. Good polar alignment
2. All points of movement locked down securely ( focusers extensions rings etc)
3. No or limited flexure
4. A suitable guidestar ( not to bright not too dim)
5. Solid mounting of mount ( is it on soft ground)
6. Balancing of scope, generally a slight weight in the driving side ... Not perfectly balanced
7. Correct guiding settings, not to aggressive etc
There's probably one or two others.
I replied recently on a thread similar to this, your problem WILL be a fairly simple one, it's just finding it, maybee a set of fresh eyes on location will help, see if you can tempt someone with a BBQ
Ive seen scopes with plastic add ons and sticky tape etc, although people think it's solid it's questionable. I'd love to help but I don't think were anywhere near.
I see from your bio you are using a refractor ?
Bang up a pic of you setup, at least that might give us a starting point for loose items. Or cables tangling etc
The good thing is once you've identified this issue you will go on to have a good time under the stars.
I will pop back soon to see how it goes... Let's get it sorted.