Hi Simon,
I'm sure others can answer this better than me....however I also started on a HiFly, and then BIC 293 so similar to you. I used this combo for the first year or so.
Then for the past 6 months I've been using a JP 145 excite ride. This wasn't difficult at all to get used to, although without dagger board, you need a different technique to get upwind.
I just got a 109 litre JP super sport a few days ago. Going to try it out tomorrow afternoon for the first time, if the wind picks up a bit.
At 80kg I have 29kg of bouyancy for the board and rig. You are 94kg (including harness, wettie etc?) so have 21kg of bouyancy. Kind of similar. I think the rule of thumb is +30 for it to be comfortable to uphaul, but you mentioned you can waterstart just, so I reckon you maybe alright.
Got a feeling I could have gone straight to the 109 litre board, so will let you know what I discover tomorrow
Andy.