Hi Barrie,
I always found 5-stringers a bit of a nonsense for a long time. Slower and harder going than a 4 and not quite as useful as a 6. In most cases, the more strings you have & the wider the neck is, the more you have to accept that you're not going to be able to play as fast & flash! That was until I found my Status bolt-on 5. The neck profile is kept almost the same as the 4 string, but just made wider. Much easier to play fast. So I guess you need to find the 5-string that feels right in the hands & doesn't work against you too much, perhaps more like your 4's.
As for the 35" scale, this is where the double bass fingering comes in. You have to be economical with the left hand (ie., using the span of the hand to cover one tone or three frets, fingering 1-2-4 below the 7th fret) & make sure that you keep the thumb behind the neck & opposite the middle finger. The latter gives the hand more chance to expand to the correct shape. If you try all this, you'll find there's almost no difference in feel between the 34 & 35 scales.