Type 9, 1st gear

Hi all,
Put the type 9 in the mk1, all good but will only pass the gate into first ocassionally
When it goes in doesnt grind or whatever and drives fine.
I changed oil, (made a bit of a difference) will select a bit more often.
I fitted a quickshift (seems good one from good uk supplier) and wondering if this could be the cause.
Anyone else had this problem?
Thinking I should just adjust the cable a bit more, but as it selects the other gears fine not sure