I don't have experience of Barton instructors these days except Martin Rushbrooke (who is a very good aeros instructor but gets booked up months ahead) and Bob Knight, with whom I did my bi-annual 'instructor' hour in the Chippy recently - also recommended.
I can well accept that the Barton Grobs are underpowered compared to other examples. But soggy handling is soggy handling. Felt just like a PA28 to me. Very dissapointing.
SSD