Guidescope Upgrade?

[Aramcheck]

I've just started using a guidescope with a spare SW 9x50 finderscope converted to connect a ZWO ASI120MM camera (as per FLO's bundle), and have had one relatively successful session with it.

With this set-up, from the Guidescope Suitability calculator I get a ratio of 1:3.15 (with Skywatcher 130dps) and 1:4.84 (SW 200dps). However, with the 130dps I can't get the OTA to balance, so would need to either add weights to the OTA, or use a different guidescope.

I'd originally been thinking of getting the ZWO 60mm focal length 280mm Finder Guider, which I presume I could fit to the OTA tube rings using a Long (SW200dps) and Medium (SW130dps) Dovetail bar. This would give an improved ratio of 1:2.02 (130dps) and 1:3.11 (200dps), and be less prone to differential flexure.  An alternative would be to stick with the existing 9x50 setup for the 200dps & to get a smaller Mini-guide scope for the 130dps (eg the Astro-Essentials one which would give a ratio of 1:472).

Which would be the better route to go down?

I only expect to be taking 2-3 min subs, as I'm only shooting OSC with a DLSR & Bortle 6 sky.

Any thoughts / advice much appreciated!

Many thanks
Ivor